the rest from `tools/convert_boost.sh`.
* replace boost::function, boost::bind with std::function and std::bind.
This required some manual fixes, notably std::placeholders,
some static_casts<>, and boost::function::clear -> = {}.
This is necessary with clip recording because for some short time after recording,
a trigger may be playable despite not yet having a region.
libs edition.
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.
It seems that using ::move_to() followed by Pango::Layout::show_in_cairo_context() leaves
the context in a state that is not correctly restored when using ::restore(). Therefore,
clear the path to avoid leaving any dangling current point
