partially done work on total source tree rework, separation of engine context and game context, generalization of renderer for different backends as well as web platform target

include/twn_game_api.h

@@ -0,0 +1,22 @@
+/* include this header in game code to get the usable parts of the engine */
+#ifndef GAME_API_H
+#define GAME_API_H
+
+
+#include "twn_context.h"
+#include "twn_rendering.h"
+#include "twn_audio.h"
+#include "twn_util.h"
+#include "twn_input.h"
+#include "twn_engine_api.h"
+
+
+/* sole game logic and display function.
+   all state must be used from and saved to supplied state pointer. */
+TWN_API extern void game_tick(void);
+
+/* called when application is closing. */
+TWN_API extern void game_end(void);
+
+
+#endif