[2/2] Settings: add support for Tinted System bar

thanks to ChameleonOs and Thinking Bridge for the base code
also thanks to @MuhammadAG for Actionbar implementation (Xposed-Tinted-Status-Bar)

this allow statusbar an navigationbar background to follow color from Top and Bottom of application

see https://plus.google.com/107971916147063794392/posts/Eaqn5UAvKDt

PS.3 :
    change String (need help here xD)
    hide some option if device unsupport navigation bar
    add more option xD

PS.4 :
    move option into new section
    better string (i hope xD)

PS.5 :
    update strings

PS7:
-fix remove from category
-another string rework

PS. 8 :
    remove gradient option

Conflicts:
	res/values/mahdi_strings.xml
	res/values/slim_arrays.xml
	src/com/android/settings/slim/NotificationDrawerStyle.java