Lightweight Java Game Library Code

Reverted the widening of Keyboard.getEventCharacter

Linux: Fixed Display.setIcon memory leak.

Windows: replace loadLibrary("jawt") with Toolkit.getDefaultToolkit() which is better and avoids classloader issues with multiple loaded natives. Additionally, getDefaultToolkit is not a privileged action, while loadLibrary is.

Windows: Added missing doPrivileged around loadLibrary("jawt")

Mac OS X: Made KeyboardEventQueue handle widened char types

Windows: Generalize getMin/MaxCursorSize to one native GetSystemMetrics

Windows: Moved is_dirty from native to java

Widened Keyboard.getEventCharacter() return type from char to int to accomodate 32 bit characters.

Windows: moved closerequested from native to java

Windows: LWJGL didn't work well with jinput, but compatibility could be greatly improved if LWJGL used DirectInput 8 (like jinput). This can't be done unconditionally, since we need the DX3 support for older versions of windows. So, I've moved most Mouse and Keyboard stuff from native to java side and generalized DirectInput access through an abstract base class, with two concrete subclasses, one for dx3 and one for dx8.