[UI] TBEditField recreates embedded widgets when doing layout

[JoshEngebretson]

tb_style_edit calls CreateFragmentContent here on layout:

https://github.com/AtomicGameEngine/AtomicGameEngine/blob/master/Source/ThirdParty/TurboBadger/tb_style_edit.cpp#L936

Which creates embedded widgets whenever there is a layout, resize, etc:

https://github.com/AtomicGameEngine/AtomicGameEngine/blob/master/Source/ThirdParty/TurboBadger/tb_editfield.cpp#L670

So for example an embedded Button would be recreated: <widget TBButton: id: 'mybutton' text: 'Click Me'>

This can get quite expensive and could be why the about dialog is slow on resize, the widgets should only be recreated if necessary, probably cached and then clear widget cache if content changes.