Repair Bugs
Some changes

Change the text of dialog, repair the next block, refine the drawevent
Stop Engine when exit program
Fixed Inverse Control and refactor the draw method
Performance Hack
Add Fps display
Move RoundTicks to Settings
add SetInversed
Merge remote-tracking branch 'origin/master' into PlayerController
Fix bugs

Improve the speed of display the next block, make controller receive the
esc first, change the ai of reverse gun(fall directly)
add pause
同上
Merge remote-tracking branch 'origin/PlayerController'

Conflicts:
	Tetris/AdvancedGUI/GameContainerPage.cs
Change the pause key
dual manual controll finish

And fix the escape bug(can pause now!)
Add 3 levels of AI

Initial level(need to be improved)