Switch to wayland

Added a simple wayland configuration.
Currently set up simple wayland configuration based on river window
manager and waybar.
Rivercarro is the layout manager, being the same in principle as rivertile,
the default layout manager for river, only it comes with smart gaps
(gaps turn off if there is only one window open)
and monocle mode (give one window all space).

Runs `keyd` in the background to replace the old `xcape` capslock switching
(capslock is escape and if held control).
Uses `swaybg` to set a wallpaper.

Added powermenu and lockscreen scripts.
Improved lockscreen script to detect and work for wayland.
Moved old rofi mode 'powermenu' to more general powermenu script,
which works with any rofi-like selector (dmenu, bemenu, wofi, etc.)
Loses some of its design quality but since it was wonky anyway,
and I rarely see the menu,
we could repurpose its functionality for a more general powermenu
concept.
Currently hardcoded for `bemenu` but can be easily swapped and possibly
even extended back to rofi.
Fixed file upload link sharing to clipboard.

Updated rofi-pass to pass-pick.
Made rofi-pass universal and less integrated to rofi - that's also the
reason for the name change.
`pass-pick` works with rofi (default), bemenu or dmenu. In theory it
should also work with any other picker that contains a stdin listing
function similar to dmenu.
It has been definitely tested both on rofi and bemenu.
The best user experience still reigns on rofi, where available keys are
displayed on the picker and the keys themselves make the most sense.
But all functions can be reached from bemenu as well, though the key
mappings are more arbitrary and can not be changed as in rofi.
The autofilling tool works with both xdotool and ydotool, so should work
both on X11 and on Wayland. Ydotool ideally requires its daemon to be
running, otherwise some of the typing may get gut off. Otherwise no
change should be necessary.

Updated qutebrowser open_download for bemenu.
Updated download opening script to work with both rofi and bemenu.
Prefers original rofi implementation but works with both, and can be set
to use a custom dmenu-like file picker as well.

Add brightnessctl and removed custom audio / brightness scripts since they
became unnecessary.

Updated bootstrap script to include system files:
With `keyd` taking its configuration from the `/etc` directory and not
home, a second stow stage was necessary. These stow files are in a
module called `system-packages` inside the top-level `bootstrap` stow
package.
They will not be installed by the default dotfile stow invocation but
have been integrated as an extra step into the install script.
Installing this module requires sudo privileges!

Switched vifm überzug to sixel graphics rendering.
überzug relies on X11 functionality to work, while sixel does not.
Unfortunately, alacritty does not work with sixel graphics yet, only
foot does (somewhat).

Waybar currently runs the gruvbox dark soft color scheme.
Added the old polybar archupdates script to waybar and extended it to
output json format with additional metadata that waybar can read.
Can still output the old plaintext format that polybar expects.
Added a wireguard connection to waybar,shows if currently
connected to either a wireguard or tun VPN service.
If so, shows an icon in the waybar - that can be hovered over to show
the full assigned IP address.
Added an upcoming event display to waybar,
a simple event indicator to show upcoming events on the calendar, on
hovering over it the tooltip lists all upcoming events.

Added `screenshot` script to take simple screenshots and
rectangle region shots of the current output.
Can be invoked through the river shortcut PrintScr:
`PrintScr` - Fullscreen screenshot
`Mod+PrintScr` - Region screenshot
`Shift+PrintScr` - Fullscreen screenshot and file upload
`Mod+Shift+PrintScr` - Region screenshot and file upload

Extended `sharefile` to take paths through stdin and make
use of `fd` if it is found on the system.

qutebrowser/.local/share/qutebrowser/userscripts/open_download

@@ -0,0 +1,112 @@
+#!/usr/bin/env bash
+# Both standalone script and qutebrowser userscript that opens a rofi menu with
+# all files from the download directory and opens the selected file. It works
+# both as a userscript and a standalone script that is called from outside of
+# qutebrowser.
+#
+# Suggested keybinding (for "show downloads"):
+# spawn --userscript ~/.config/qutebrowser/open_download
+#     sd
+#
+# Requirements:
+#  - rofi (in a recent version), or bemenu
+#  - xdg-open and xdg-mime
+#  - You should configure qutebrowser to download files to a single directory
+#  - It comes in handy if you enable downloads.remove_finished. If you want to
+#    see the recent downloads, just press "sd".
+#
+# Thorsten Wißmann, 2015 (thorsten` on Libera Chat)
+# Refactored to work with bemenu by Marty Oehme, 2021 (@martyo@matrix.org on Matrix)
+# Any feedback is welcome!
+
+set -e
+
+# open a file from the download directory using rofi
+DOWNLOAD_DIR=${DOWNLOAD_DIR:-${QUTE_DOWNLOAD_DIR:-$HOME/downloads}}
+# the name of the rofi-like command
+if [ -n "$ROFI_CMD" ]; then
+    :
+elif command -v rofi >/dev/null 2>&1; then
+    ROFI_CMD="rofi"
+    ROFI_ARGS=${ROFI_ARGS:-(
+    -monitor -2 # place above window
+    -location 6 # aligned at the bottom
+    -width 100  # use full window width
+    -i
+    -no-custom
+    -format i # make rofi return the index
+    -l 10
+    -p 'Open download:' -dmenu
+)}
+elif command -v bemenu >/dev/null 2>&1; then
+    ROFI_CMD="bemenu"
+    ROFI_ARGS="${ROFI_ARGS:--il 10}"
+fi
+
+msg() {
+    local cmd="$1"
+    shift
+    local msg="$*"
+    if [ -z "$QUTE_FIFO" ]; then
+        echo "$cmd: $msg" >&2
+    else
+        echo "message-$cmd '${msg//\'/\\\'}'" >>"$QUTE_FIFO"
+    fi
+}
+die() {
+    msg error "$*"
+    if [ -n "$QUTE_FIFO" ]; then
+        # when run as a userscript, the above error message already informs the
+        # user about the failure, and no additional "userscript exited with status
+        # 1" is needed.
+        exit 0
+    else
+        exit 1
+    fi
+}
+
+if ! [ -d "$DOWNLOAD_DIR" ]; then
+    die "Download directory »$DOWNLOAD_DIR« not found!"
+fi
+if ! command -v "${ROFI_CMD}" >/dev/null; then
+    die "Rofi command »${ROFI_CMD}« not found in PATH!"
+fi
+
+crop-first-column() {
+    cut -d' ' -f2
+}
+
+ls-files() {
+    # add the slash at the end of the download dir enforces to follow the
+    # symlink, if the DOWNLOAD_DIR itself is a symlink
+    # sort by newest
+    find "${DOWNLOAD_DIR}/" -maxdepth 1 -type f -printf "%T+ %f\n" | sort -r
+}
+
+mapfile -t entries < <(ls-files)
+
+# we need to manually check that there are items, because rofi doesn't show up
+# if there are no items and -no-custom is passed to rofi.
+if [ "${#entries[@]}" -eq 0 ]; then
+    die "Download directory »${DOWNLOAD_DIR}« empty"
+fi
+
+line=$(printf '%s\n' "${entries[@]}" |
+    crop-first-column |
+    $ROFI_CMD "${ROFI_ARGS[@]}") || true
+if [ -z "$line" ]; then
+    exit 0
+fi
+
+msg info "file is $line"
+path="$DOWNLOAD_DIR/$line"
+filetype=$(xdg-mime query filetype "$path")
+application=$(xdg-mime query default "$filetype")
+
+if [ -z "$application" ]; then
+    die "Do not know how to open »$line« of type $filetype"
+fi
+
+msg info "Opening »$line« (of type $filetype) with ${application%.desktop}"
+
+xdg-open "$path" &