*) Add support for integer requiresConfig resources (previously supported
only strings and bools). Preference is removed if the int is 0.
*) Add a new attribute requiresConfigMask that takes a string decimal int.
If requiresConfig is an integer then the pref is removed if
(requiresConfig resource value & requiresConfigMask value) == 0.
If requiresConfig is not an integer type then requiresConfigMask
is ignored.
*) Code clean-up for the rest of checking requiresConfig.
Change-Id: Ic2622809c02a94d9cecf6f59ed6e689fdb835458
3c54d58691