Tracks cannot be rec-enabled at the same as clips/slots/cues/triggers are rec-enabled. This means
that the "rec-enable" button in a TriggerStrip should not be setting track record enabled
status. Instead, it is a GUI-only button that causes a redraw with the appropriate slot
icons (play, record)
Still a bit of work to be done here but functional again and avoids an assert() failure
This is mostly a simple lexical search+replace but the absence of operator< for
std::weak_ptr<T> leads to some complications, particularly with Evoral::Sequence
and ExportPortChannel.
This also changes TriggerBox Selection to act on release
(like all other selection). Otherwise strip selection will
de-select the TriggerBox on mouse-release.
