Windows: When parented, take focus on mouse click
Linux: When parented, take focus on click
Windows: Use current Mouse.isGrabbed() when determining grab status
Windows: Don't grab mouse when not focused
Added line about tracking parent size to Display.setParent javadoc
2.0a3 version string
Added fullscreen switching to DisplayParentTest
Let the Display resize itself to match its parent, if non null
updated and added license where needed
Bumped Sys.JNI_VERSION
