audio_set() -> audio_set_parameter(), with string based convention

src/rendering/twn_draw.c

@@ -35,7 +35,7 @@ void render_queue_clear(void) {
 }
 
 
-void draw_9slice(const char *texture_path, int texture_w, int texture_h, int border_thickness, Rect rect, Color color) {
+void draw_nine_slice(const char *texture_path, int texture_w, int texture_h, int border_thickness, Rect rect, Color color) {
     const float bt = (float)border_thickness; /* i know! */
     const float bt2 = bt * 2; /* combined size of the two borders in an axis */