FWB: Allow disabling of FC dialogs (1/2)

Change-Id: If87aa74ebb45849f6e5fe3a53ce9beeaac28f624

Conflicts:
	core/java/android/provider/Settings.java
Base: Implement ad blocker [2/3]

*Hosts File Manager
*Picked from Dirty Unicorns
*This uses two prebuilt hosts files and switches between them by symlinking

AICP:
PS5: rebase

Change-Id: I23a1d9f1dcca623a556defb5eaae94f4e9e3b21d

Conflicts:
	core/java/android/provider/Settings.java