We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
Having to subclass GUI::Model for even the simplest type of hand-built
TreeView makes them a bit unpleasant to work with at the moment. :^)
This adds such a GUI::Model subclass that is specifically designed for
adding nodes to a TreeView manually, supporting text and an optional
icon by default, and allowing for further data when subclassing the Node
class.
