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.
Some plugins correct their own size when resized which can lead
to endlessly growing GUIs. In particular this issue exists
if Ardour's plugin-toolbar forces a plugin to grow in size to fill
the allocated space. While the plugin aims for fixed aspect-ratio.
This will need a proper solution involving VST's checkSizeConstraint,
however GTK+2 does not have an appropriate API...
