Started the porting of plugins

Added the ScreenGrab plugin.
Added the Controller plugin.
Updated the Ads system.
Added the Delay plugin.
Updated a little bit the SpiButton.
Fixed the SpiBitmapFont.
Fixed the SpiBitmapFontButton.
Added new methods to the SpiRect class.
Added the mouse control plugin.
Added the extended sprite.
Fixed some errors in the SpiMath and SpiVelocity classes.
Added the SpiCollision plugin (NOT WORKING YET!).