remove /include/twn_config.h, move defauls to relevant headers

src/twn_loop.c

@@ -22,6 +22,10 @@
 #include <limits.h>
 
 
+#define TICKS_PER_SECOND_DEFAULT 60
+#define PACKAGE_EXTENSION "btw"
+
+
 static int event_callback(void *userdata, SDL_Event *event) {
     (void)userdata;