Move modules from MobileFrontend into ZeroRatedMobileAccess

TODO: Make tests run (requires RL changes in MobileFrontend extension)
Depends on: https://gerrit.wikimedia.org/r/#/c/57554/

Change-Id: I04e0c37af78bd16754aa2fff734a02b9abf00b0f
Merge "Move modules from MobileFrontend into ZeroRatedMobileAccess"