Move string natives from logic to core (bug 4406 part 8, r=fyren).

--HG--
rename : core/smn_string.cpp => core/logic/smn_string.cpp

core/Makefile

@@ -25,8 +25,7 @@ OBJECTS = AdminCache.cpp CDataPack.cpp ConCmdManager.cpp ConVarManager.cpp CoreC
 OBJECTS += smn_bitbuffer.cpp smn_console.cpp smn_core.cpp \
 	smn_datapacks.cpp smn_entities.cpp smn_events.cpp smn_fakenatives.cpp \
 	smn_filesystem.cpp smn_gameconfigs.cpp smn_halflife.cpp \
-	smn_handles.cpp smn_keyvalues.cpp \
-	smn_player.cpp smn_string.cpp \
+	smn_handles.cpp smn_keyvalues.cpp smn_player.cpp \
 	smn_usermsgs.cpp smn_menus.cpp smn_database.cpp smn_vector.cpp \
 	smn_hudtext.cpp smn_nextmap.cpp
 OBJECTS += ExtensionSys.cpp 		\