Modify SelectableLabel to use TextEdit instead
Discussion: #91 (closed)
SelectableLabel wont resize properly when using QQC2.TextArea, due to TextArea having implicitSize resizing disabled after the initial size.
TextEdit is handled more like a Label is, so it resizes correctly. Wrapping it inside Control and exposing the expected properties and signals it should be a drop-in replacement for the old TextArea based SelectableLabel.
SelectableLabel also has its own, smaller context menu now.
Note that this may be API breaking so we need to do a lot of testing.