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/c-mode/.yas-parents

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

configs/shared/.emacs.d/snippets/c-mode/stdio

@@ -0,0 +1,5 @@
+# -*- mode: snippet -*-
+# name: <stdio.h>
+# key: sio
+# --
+#include <stdio.h>

configs/shared/.emacs.d/snippets/c-mode/stdlib

@@ -0,0 +1,5 @@
+# -*- mode: snippet -*-
+# name: <stdlib.h>
+# key: slb
+# --
+#include <stdlib.h>

configs/shared/.emacs.d/snippets/c-mode/struct

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: struct
+# key: struct
+# --
+typedef struct $1 {
+  $2
+} $1_t;