Frame rate fix

When GameDroid was originally created, the devices we used for testing couldn't run it much faster than full speed. For this reason (and because it was made for a school project with tight deadlines) we ended up not implementing a frame rate limit.

Now, 5 years later, even low-end smartphones can run the emulator at extremely high speeds, making most games very difficult to play.

A few people have brought this up now so I've decided to fix it. The frame rate is now limited to 60fps by default. The limit can be disabled via a new setting.

Initial release

The version of GameDroid submitted at the end of COMP 3004.