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/cli.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef struct {
+    bool is_debug_mode;
+} cli_arguments;
+
+int cli_init(cli_arguments* const args, const char* const argv[],
+             const int argc);