Initial import of convar stuff

1) Natives to create, find, set, and get convars
2) "cvars" option added to sm menu
3) Some internal additions to CPlugin to store a convar list
Still some things left to do...

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40463

core/systems/PluginSys.cpp

@@ -504,11 +504,26 @@ size_t CPlugin::GetLangFileCount() const
 	return m_PhraseFiles.size();
 }
 
-unsigned int CPlugin::GetFileByIndex(unsigned int index) const
+unsigned int CPlugin::GetLangFileByIndex(unsigned int index) const
 {
 	return m_PhraseFiles.at(index);
 }
 
+void CPlugin::AddConVar(ConVar *convar)
+{
+	m_ConVarList.push_back(convar);
+}
+
+size_t CPlugin::GetConVarCount() const
+{
+	return m_ConVarList.size();
+}
+
+ConVar *CPlugin::GetConVarByIndex(size_t index) const
+{
+	return m_ConVarList.at(index);
+}
+
 /*******************
  * PLUGIN ITERATOR *
  *******************/