Added per-game Cheats menu in-game

Since our performance is pretty much good enough for most games, I wanted to focus more on other basic stuff that Azahar already has, that we don't have access to right now.

Here's the first of the major changes that I really want to add:

• Added per-game Cheats menu. You can press L/R keys on ingame menu to access Cheats menu. Here you can add/remove/modify/enable/disable individual cheats for your loaded game.
• You can also put the cheats inside the cheats folder in your directory: dekopon/cheats/.txt.
• For cheats to take effect, you may have to leave an in-game room and re-enter. Another sure-fire way is to restart if you can't see it in action, for example 60 FPS cheats.
• Disabled Right Eye Rendering by default since 90% games take benefit of it being disabled. For games that have visual artifacts, you can still enable it in in-app, dw.