feat: use opengl

TODO:
- Texture isn't scaling properly
- I need to reverse the colours in the frag shader

build.zig

@@ -31,6 +31,9 @@ pub fn build(b: *std.build.Builder) void {
     // TOML Library
     exe.addPackagePath("toml", "lib/zig-toml/src/toml.zig");
 
+    // OpenGL Bindings
+    exe.addPackagePath("gl", "lib/gl_4v5.zig");
+
     // Zig SDL Bindings: https://github.com/MasterQ32/SDL.zig
     const sdk = Sdk.init(b);
     sdk.link(exe, .dynamic);