implement game configuration file

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

src/rendering/twn_gl_15_rendering.c

@@ -104,7 +104,7 @@ void use_2d_pipeline(void) {
 
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
-    glOrtho(0, RENDER_BASE_WIDTH, RENDER_BASE_HEIGHT, 0, -1, 1);
+    glOrtho(0, (double)ctx.base_render_width, (double)ctx.base_render_height, 0, -1, 1);
 
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();