Handle the Buttons.<x>Thumbstick<y> enumeration values in GamePadState.IsButton(Up|Down).
Fix PSM analog sticks having their Y axis inverted.
Provide a sensical exception when an attempt is made to use GamePad or TouchPanel without the appropriate app.xml entries on Playstation Mobile
Merge pull request #1602 from kevingadd/psm_input_fixes

PlayStation Mobile input fixes
Merge remote-tracking branch 'upstream/develop' into develop