Emulator

Name of clone:
https://code.google.com/r/xtrafear-dolphin-emu/
https://code.google.com/r/xtrafear-dolphin-emu/source/detail?r=b2775f108dab6d12fb11a17b14b6713ada15c638

Purpose of code changes on this branch:
Adding a button to toggle the display of the On-Screen Display Messages.

When reviewing my code changes, please focus on:
I felt it made the emulation window look a little cleaner without the little On-Screen Display messages :P. The default mode for it is set to ON, and can be found in the interface tab under config to toggle the status of it. I didn't see any option to toggle it, so I figured I would make one for maybe somebody else like me wanting to turn them off.

After the review, please pull into branch:
master