Rftool refine rf2 integration

[gismo2004]

What changed

• expanded the widget options with HideModel, HideState, HideTelemetry, and TextColor
• reworked the normal widget layout to fit text dynamically instead of using the fixed two-label layout
• model-name changes trigger a refit with the correct font size
• throw a warning if widget is used multiple times

[egonl]

What would be the use case for having several RF Tools widgets running at the same time? A considerable amount of code in this PR deals with making this possible, and it's unclear to me why I would like to do that.

[gismo2004]

I absolutely agree that this is a monster and I already regretted to start with this. I stumple from one rabbit hole to the next one 🤦 however the main goal for me was to make it possible to have the widget in toolbar. When doing that one would loose the ability to open rf2 ui by switching to fullscreen. So I thought it would be a good idea to not loose this ability and that was where the nightmare started (having multiple instances) 😅 if you think that is too much, and it's not needed, I am happy to remove all that and make it a single tool again. Maybe with an notification that this widget can only be used once?