mail,mpv,qutebrowser,vifm: Fix small issues

Added videos directory to vifm quick marks (`v`).

Fixed (hopefully) qutebrowser statusbar hiding and showing.

Improved mail checking script password file handling by switching the
hard-coded path to one still somewhat hard-coded, but encapsulated in a
variable to make changing it later on easier. The script is a bit
slap-dash anyway, so when refactored should be refactored overall.

Added `gallery-dl` handling by mpv, whenever a link starting with
`gdl://` is passed in.

mail/.local/bin/mail-check

@@ -17,6 +17,8 @@
 # MBSYNC_POST="/bin/usr/cmd-to-run"
 # MBSYNC_NOTIFY=1
 
+PASSWORD_FILE="$HOME/.local/share/pass/misc/aerc-gmail-app-password.gpg"
+
 prehook() {
   if [ -n "$MBSYNC_PRE" ]; then
     eval "$MBSYNC_PRE"
@@ -64,7 +66,7 @@ checkonline() {
 # warn user that he has to enter his password in a moment
 # to stop catching him offguard or entering something by accident
 checkwarnuser() {
-  agt=$(gpg2 --decrypt --no-tty --quiet --no-verbose --for-your-eyes-only --pinentry-mode cancel ~/.local/share/pass/misc/aerc-gmail-app-password.gpg 2>&1)
+  agt=$(gpg2 --decrypt --no-tty --quiet --no-verbose --for-your-eyes-only --pinentry-mode cancel "$PASSWORD_FILE" 2>&1)
   if echo "$agt" | grep -qE 'No secret key'; then
     notify "Mail: Password phrase needed!"
     sleep 2.5