[2/2] OmniGears: Lockscreen blur enhancements

Adds an option to set blur intensity

Base: https://gerrit.omnirom.org/#/c/5705/

Change-Id: Ife0941c00ebf1cbfc5804a059d337cf4e8528666

Conflicts:
	res/values/custom_strings.xml
	res/xml/lockscreen_settings.xml
	src/org/omnirom/omnigears/interfacesettings/LockscreenSettings.java