Enable account switcher in contact creation

- remove account selection step before contact creation
- (phone) put account info on the right side of photos
  instead of having "header" for it
-- renamed header_* ids for account stuffs as they may not be
   part of header any more.
- add migration functionality to EntityModifier
- add test for it
- no optimal layout

Bug: 4184675
Change-Id: I0e777f9aa37a7c9145bd430f897f8068b0bede56
18 files changed