-ability to set default textures in shader (needed for visual shader editing)

-work in progress new graph system (will replace current one)
-crash fix in s3m loader (out of bounds acess)
-fixed vbox overriding of separation (fixes empty line between section tabs)

drivers/chibi/cp_loader_s3m.cpp

@@ -162,7 +162,7 @@ CPLoader::Error  CPLoader_S3M::load_sample(CPSample *p_sample) {
 		p_sample->set_default_volume(def_volume);
 		p_sample->set_name(name);
 		
-		char scrs[4];
+		char scrs[5];
 		file->get_byte_array((uint8_t*)scrs,4);
 		scrs[4]=0;