Massive configuration overhaul

Currently paying the price of months of non-diligent git usage.

Here's what has changed.

- Theming support in Gvcci and wpgtk
- Dropping support for i3
- Supporting EXWM
- Many Elisp modules
- Collapsed redundant directories in ./configs

configs/shared/.config/mpd/mpd.conf

@@ -0,0 +1,4 @@
+db_file "~/.config/mpd/database"
+log_file "syslog"
+# music_directory "~/.local/share/sounds"
+auto_update "yes"