[SQUASHED] [1/2] Status bar Network traffic (ported from OmniRom)

- This codes are not mine an here i'm giving the proper credits
Commits inside and they authors:
@htchoi1995: https://github.com/omnirom/android_frameworks_base/commit/4268d2d3eaa91598b6a820c43f78779f9da29689
@Haus1: https://github.com/omnirom/android_frameworks_base/commit/12daeeb5de44f5992bf0eaff6abf606e3be879e5
@Haus1: https://github.com/omnirom/android_frameworks_base/commit/017c56cdb2011cea0026b97e5c40ac9b567a072e

Change-Id: I8784462ed65ad4215c65157be98a544d4be8e362