✨ Generic game text render function

This should gradually replace all the direct rendering of game texts
throughout the code. The interface is made to closly mirror that of the
art fonts as that is what will eventually be used for rendering Unicode
fonts both in the menus and ingame.

fixup! ✨ Generic game text render function

Source/engine/render/cel_render.cpp

@@ -1,5 +1,5 @@
 /**
- * @file cel_render.hpp
+ * @file cel_render.cpp
  *
  * CEL rendering.
  */