added filter overlay. still contains errors
forgot to add these last file to last commit
Merge branch 'develop'

Conflicts:
	res/layout/filter_overlay.xml
	res/values/strings.xml
	src/de/otaris/zertapps/privacychecker/appsList/AllAppsActivity.java
fixed crash in appsbycategory
started updating filter layout xml
started implementation of filter and removed untranslated permission labels from database
code cleaning + filter overlay display fixes
finished filtering
fixed filter logic and layout/label
refactored the way sorting information is stored
Merge branch 'feature/Filter' into develop

Conflicts:
	assets/pca.db
	res/layout/filter_overlay.xml
	res/values/strings.xml
	src/de/otaris/zertapps/privacychecker/appsList/AppsByCategoryActivity.java
	src/de/otaris/zertapps/privacychecker/appsList/InstalledAppsActivity.java
	src/de/otaris/zertapps/privacychecker/appsList/SortableAppListActivity.java
	src/de/otaris/zertapps/privacychecker/appsList/SortableTabbedAppListActivity.java