Remove more unused things from CryCommon and CrySystem. (#709)

Lots of unrelated removals, I basically tried to remove everything exposed via gEnv that isn't used anymore, and following the threads found a few other things to remove also.

Code/Sandbox/Editor/LevelInfo.cpp

@@ -97,10 +97,6 @@ void CLevelInfo::ValidateObjects()
 
         pObject->Validate(m_pReport);
 
-        CUsedResources rs;
-        pObject->GatherUsedResources(rs);
-        rs.Validate(m_pReport);
-
         m_pReport->SetCurrentValidatorObject(NULL);
     }