Some clean up, web version prepare

src/ISaveable.h

@@ -1,7 +1,7 @@
 #pragma once
 #include "external/nlohmann/json.hpp"
 
-namespace ZL {
+namespace FRG {
 
 struct ISaveable {
     virtual void save(nlohmann::json& out) const = 0;
@@ -9,4 +9,4 @@ struct ISaveable {
     virtual ~ISaveable() = default;
 };
 
-} // namespace ZL
+} // namespace FRG