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/CryEngine/CrySystem/UnixConsole.cpp

@@ -783,12 +783,6 @@ void CUNIXConsole::KeyEnter()
 
     if (pushCommand)
     {
-        CSystem* pSystem = static_cast<CSystem*>(gEnv->pSystem);
-#if defined(CVARS_WHITELIST)
-        ICVarsWhitelist* pCVarsWhitelist = pSystem->GetCVarsWhiteList();
-        bool execute = (pCVarsWhitelist) ? pCVarsWhitelist->IsWhiteListed(m_InputLine, false) : true;
-        if (execute)
-#endif // defined(CVARS_WHITELIST)
         {
             m_CommandQueue.push_back(m_InputLine);
         }