Instead of everyone overriding save_to() and set_property() and doing
a pretty asymmetric job of implementing the various properties, let's
add a bit of structure here.
Object properties are now represented by a Core::Property. Properties
are registered with a getter and setter (optional) in constructors.
I've added some convenience macros for creating and registering
properties, but this does still feel a bit bulky. We'll have to
iterate on this and see where it goes.
Since space is divided evenly between widgets with SizePolicy::Fill,
we were sometimes ending up with a couple of unused pixels after the
last widget (due to rounding.)
Fix this by always giving the slack pixels at the end to the very last
auto-sized widget in the layout.
This fixes an issue where it was sometimes possible to click on an
"unreachable" part of a Splitter widget. :^)
