Rewrite the entire code-base

The following changes are focused upon:
- Modularity
- Doing away with globals
- No heap allocations
- Better command line interface
- Switch from Xlib to XCB
- More verbose type definitions
- Implement a single-file config by utilising X-macros

include/x11.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <xcb/xcb.h>
+
+typedef xcb_connection_t x11_connection;
+
+x11_connection* x11_connection_open(void);
+void x11_connection_close(x11_connection* const connection);
+int x11_set_root_name(x11_connection* const connection,
+                      const char* const name);