-fixed export templates not loading/exporting on Windows

-fixed TouchScreenButton with stretch2d
-fixed(?) OSX crash on startup (test!!)
-compilation fixes on windows
-CollisionPolygon editor works again
-find buttons en find dialog
-TileMap editor cleanup (removed "error", made nicer)
-viewport flicker fixed
-make .scn default extension for saving scenes
-export the rest of the network classes to gdscript

core/io/file_access_zip.cpp

@@ -197,7 +197,8 @@ bool ZipArchive::try_open_pack(const String& p_name) {
 		String fname = String("res://") + filename_inzip;
 		files[fname] = f;
 
-		PackedData::get_singleton()->add_path(p_name, fname, 0, 0, this);
+		uint8_t md5[16]={0,0,0,0,0,0,0,0 , 0,0,0,0,0,0,0,0};
+		PackedData::get_singleton()->add_path(p_name, fname, 0, 0, md5, this);
 
 		if ((i+1)<gi.number_entry) {
 			unzGoToNextFile(zfile);