Support FastLED corkscrew mapping

[LarsStegman]

Is your feature request related to a problem? Please describe.
I have a lamp that I corkscrewed a led strip around.

Describe the solution you'd like
FastLED 3.10.2 supports corkscrew mapping. It would be great if WLED would support this.

Describe alternatives you've considered
Keep using it as it is.

Additional context

https://github.com/FastLED/FastLED/blob/master/examples/FestivalStick/curr.h

[DedeHai]

It does support this https://kno.wled.ge/advanced/mapping/

[LarsStegman]

True, but then you have to make the mapping manually. This would do it almost completely automatically.

[DedeHai]

Unfortunately, flash space is very limited, so this needs to be an external map generator.

[netmindz]

If you could extract just the mapping code you could possibly create a usermod that crashed the WLED map file