IMS-VT: Support for one way video

- Support for answer as one way video
- Answer with VT_TX and VT_RX
- Revert "Cleanup AnswerFragment glowpad UI"
  This reverts commit 7ba13e9d001014d1ad23be29ad6847ad65951fbb.
- Upgrade/Downgrade one way video support

Change-Id: I7d9b631e0c6084cf4e8d59f8ee3088952ba9b9fb

IMS-VT: Show glowpad view with accept/reject for most video upgrade cases

- Show the glowpad view with all options only when upgrading
  from Volte to VT

- For all other cases, show the glowpad with accept/reject only

Change-Id: I41ecbda40db7c3c69428fc4272f8bfbd258e2980

IMS-VT: Align answer targets array for VT call properly

Align answer targets array for VT call properly in both
with and without sms cases such that user should always
swipe to the right to answer the call as video call and
swipe to left always answers the call as audio call

Change-Id: I07c4e68451db87f7e127ce1ed2aed25be5131471
CRs-Fixed: 921097