Some clean up, web version prepare

src/render/ShadowMap.cpp

@@ -3,7 +3,7 @@
 #include <iostream>
 #include <cmath>
 
-namespace ZL {
+namespace FRG {
 
     // Build a look-at view matrix (column-major, same convention as the engine).
     static Eigen::Matrix4f lookAt(const Eigen::Vector3f& eye,
@@ -167,4 +167,4 @@ namespace ZL {
         glViewport(0, 0, Environment::width, Environment::height);
     }
 
-} // namespace ZL
+} // namespace FRG