Deprecate 'live' event in favor of 'setup' and 'teardown'

Mostly relevant to ve.ce.View and related mixins, this is a
cleanup for live events. Now while ve.ce.View still has the
internal this.live property, the events emitted are either
'setup' or 'teardown' and the code responds to each accordingly.

Bug: 55505
Change-Id: Ieddbf5c684eb0edc3130034de64eb284aeaebbda
Merge "Deprecate 'live' event in favor of 'setup' and 'teardown'"