We now have two basic methods for CoreSelection
* when selecting a stripable, use ::select_stripable_and_maybe_group() with
appropriate arguments to cover the group selection aspects.
* when selecting an automation control that is part of a stripable, call
::select_stripable_with_control()
The old, more simply named methods (set/add/toggle etc.) have all been
made private, and their internal implementations changed somewhat.
This commit includes changes to control surfaces that use CoreSelection directly.
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.
libardourcp and now libardour_midisurface are not control
surfaces, but helper libraries for those.
They need to be deployed to the library folder (shared between
ctrl surfaces) and not scanned as ctrl surfaces at runtime.
