Switch all GUI's from two class to only one

[javizqh]

For now we are using the old 2 class approach and to be able to switch to one it is needed to solve the UI rendering issues with it

[espilya]

Can I get more context of this issue?
Are ThreadGUI and GUI the two classes that should be merged?

[javizqh]

Yes, you can use as a example the basic vacuum cleaner done by Óscar

[javizqh]

@espilya have you make any progress with this issue?
If not @dduro2020 and @javizqh will start working on it.

[espilya]

@javizqh I've made almost no progress on this. Continue as I see it will be easier for you to complete this issue.

[javizqh]

Thanks for trying