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/java-mode/.yas-parents

@@ -0,0 +1 @@
+text-mode

configs/shared/.emacs.d/snippets/java-mode/public-static-void-main

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: public static void main
+# key: psvm
+# --
+public static void main(String[] args) {
+    $1
+}