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.

mpv/.config/mpv/scripts/gallery-dl.lua

@@ -0,0 +1,32 @@
+-- gallery-dl_hook.lua
+--
+-- load online image galleries as playlists using gallery-dl
+-- https://github.com/mikf/gallery-dl
+--
+-- to use, prepend the gallery url with: gallery-dl://
+-- e.g.
+--     `mpv gallery-dl://https://imgur.com/....`
+
+local utils = require 'mp.utils'
+local msg = require 'mp.msg'
+
+local function exec(args)
+    local ret = utils.subprocess({args = args})
+    return ret.status, ret.stdout, ret
+end
+
+mp.add_hook("on_load", 15, function()
+    local url = mp.get_property("stream-open-filename", "")
+    if (url:find("gdl://") ~= 1) then
+        msg.debug("not a gdl:// url: " .. url)
+        return
+    end
+    local url = string.gsub(url,"gdl://","")
+
+    local es, urls, result = exec({"gallery-dl", "-g", url})
+    if (es < 0) or (urls == nil) or (urls == "") then
+        msg.error("failed to get album list.")
+    end
+
+    mp.commandv("loadlist", "memory://" .. urls)
+end)