Enhance the Cheat List dialog.

[GoogleCodeExporter]

First time using VBA RR and it's great. Love the new advancements. However, the 
cheat list menu is still a bit rough.

I have a few sugestions to improve it (the ideal cheat list would work like the 
FCEUX's one though):

1. Allow one to edit a previously entered code by double clicking the code. In 
order to change a code, you have to delete it and add it again with the 
changes. It makes it a pain to discover new codes by changing address/values 
numbers. (Again, FCEUX's cheat list is the ideal example as to how to do a 
simple but completely great cheat list menu.)

2. Allow the Delete key to be used to delete code entries instead of having to 
go back and forth to the Remove button on the bottom. When making and testing 
lots of cheats, it would be great to just press a key to delete the unwanted 
stuff.

3. Unbind the cheats from save states. If you enter a cheat and then load a 
save state from before you entered the cheat, the cheat disappears. It is 
absolutely infuriating to be searching for cheats, adding and testing out 
different results, only to have them disappear if you load a previous save 
state.

Original issue reported on code.google.com by reyvgm on 29 Oct 2010 at 11:58