Multiple fixes

Added:
* automatically hide icon packs from the app drawer

Fixed:
* pixelated icons in some icon packs
* calendar icon not updating
* disappearing icon when desktop is locked
* widgets being draggable when desktop is locked
* fixed notification badge on folder not disappearing
* crashes in Icon menu
Changelog
Merge remote-tracking branch 'origin/master'

Conflicts:
	res/values-zh-rTW/strings.xml