impr: allow multiple funboxes with css (@notTamion)

[notTamion]

Description

Allows enabling multiple funboxes that have a stylesheet. Which funboxes should be deemed compatible with each other will need some discussion

[Miodec]

You will need to go through the list of funboxes and check if they alter the same element. For example, now, you can enable mirror and upside down at the same time, but because they edit the same dom element, over overrides the other. Ill convert to draft.

[notTamion]

there are more combinations that i am not sure whether we should allow, for example: crt and spaceballs (having both enabled with still tilt the screen but no longer display the background image from spaceballs)

[Miodec]

Any combinations which change the behavior like that should be not allowed.

[notTamion]

Should have added validation for all incompatible funboxes now. ready for review

[Miodec]

I don't fully like this approach. It creates what seem to be quite exclusive properties, but they should remain quite generic (worst offender of this is mirror, having its own property with the same name). For example, instead of movesText and rotatesText we could have css:typingTest, because they both modify that element. We might also want a new object key, like cssModifications (or something along those lines) to drop the css prefix.

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[Miodec]

Gonna put this on hold while #6063 is being finished up, Ill help you merge afterwards if needed.

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[Miodec]

Funbox refactor is now on master. Have a look and let me know if you need help.

[notTamion]

should be ported over properly i didn't really extensively test it as i am a bit handicapped right now cause my gpu decided to die yesterday so i can only use 1 monitor for the moment.

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