implement game configuration file

this integrates https://github.com/cktan/tomlc99 into the repo as a dependency

src/twn_camera.c

@@ -1,5 +1,6 @@
 #include "twn_camera.h"
 #include "twn_config.h"
+#include "twn_engine_context_c.h"
 
 #include <math.h>
 
@@ -37,7 +38,7 @@ Matrix4 camera_perspective(const Camera *const camera) {
     /* from cglm */
     Matrix4 result = {0};
 
-    const float aspect = RENDER_BASE_RATIO;
+    const float aspect = (float)(ctx.base_render_width / ctx.base_render_height);
 
     const float f  = 1.0f / tanf(camera->fov * 0.5f);
     const float fn = 1.0f / (CAMERA_NEAR_Z - CAMERA_FAR_Z);