Add footer actions to Call Details.

Some of these are moved down from the overflow. Others are added
from the list of those shown after a call log list item long press.

This hooks up the block/unblock functionality, although there is
still polish (eg. icons) and cleanup (some noted as TODOs), to
complete still.

Bug: 24109819
Change-Id: I129f5b09ac1c5edb66ab5bd91a46b18961240fb5