SlimLauncher: Hidden-apps setting

Forward port from CM 10.2
PS3: Don't rename and incorporate changes from Devkota
PS4: Update German translation
PS5: Remove translations
PS7: Hide widgets from widget list
PS9: Remove debug output
PS11: Rebase

Change-Id: Ie06b288e22c2678fb09da1bf42d46922b8319e01