Save States:

1. Added a header, including the Game ID (old states are obsolete unless the gameid is appended to the beginning) so states from different games can't be cross-loaded
2. Added loading/saving from/to file
3. Added loading of last saved state (F11)
4. Added "Undo State": Load the backed up last overwritten state (if you press save instead of load) (F12)
5. State code cleanup

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3560 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/DolphinWX/Src/Globals.h

@@ -31,6 +31,10 @@ enum
 {
 	IDM_LOADSTATE = 200, // File menu
 	IDM_SAVESTATE,
+	IDM_LOADLASTSTATE,
+	IDM_UNDOSTATE,
+	IDM_LOADSTATEFILE,
+	IDM_SAVESTATEFILE,
 	IDM_SAVESLOT1,
 	IDM_SAVESLOT2,
 	IDM_SAVESLOT3,