Backport of the Android 4.0 property animation framework to Android 1.5+.
- All the classes in android.animation are present, except for LayoutTransition as it requires View.OnLayoutChangeListener which only exists starting from Android 4.0. As this is missing an integral part of View, this is non-trivial to port.
- The java.util.*Property classes were also backported.
- The backported classes have been moved to backports.animation (from android.animation) and backports.property (from android.util).
- Backported by Wladimir J. van der Laan