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/.emacs.d/snippets/python-mode/init

@@ -0,0 +1,6 @@
+# -*- mode: snippet -*-
+# name: dunder init
+# key: ctor
+# --
+def __init__(self$1):
+    $2