Non intrusive incall ui rework

- Use glow pad with accept and reject target
- Button to open fullscreen ui
- Background button
- Swipe down to background

Change-Id: I12ea058ed970b13608c5abfa8c0cd535dfc621ae

Conflicts:
	res/layout/card_call_incoming.xml
	res/values/dimens.xml

Additional Changes:
- Changes for Holo (Dark) theme