Some clean up, web version prepare

src/Environment.cpp

@@ -13,7 +13,7 @@
 #include <emscripten/html5.h>
 #endif
 
-namespace ZL {
+namespace FRG {
 
 
 
@@ -92,4 +92,4 @@ void Environment::setFullscreen(bool enable) {
 #endif
 }
 
-} // namespace ZL
+} // namespace FRG