Break out the game demo into multiple source and include files, add a bunch of missing assets, conform to the new subsystems interface from libakgl

src/init.c

@@ -0,0 +1,18 @@
+#include <akgltest.h>
+
+akerr_ErrorContext AKERR_NOIGNORE *akgltest_load_assets()
+{
+    PREPARE_ERROR(e);
+    for ( int i = 0; i < numsprites ; i++) {
+	strcpy((char *)&dirnamebuf, spritepaths[i]);
+	SDL_Log("Loading sprite %s (%d of %d)....", (char *)&dirnamebuf, i, numsprites);
+	PASS(e, akgl_sprite_load_json((char *)&dirnamebuf));
+    }
+    for ( int i = 0; i < numchars ; i++ ) {
+	strcpy((char *)&dirnamebuf, characterpaths[i]);
+	SDL_Log("Loading character %s (%d of %d)....", (char *)&dirnamebuf, i, numchars);
+	PASS(e, akgl_character_load_json((char *)&dirnamebuf));
+    }
+    SUCCEED_RETURN(e);
+}
+