Add Turbo to the RGB LED stack

[TheTrainGoes]

Ability to add the turbo LED to the RGB LED stack + Web UI addition for configuring it.

I am unsure where it should be placed in the RGB LED chain.

Ideally after the Player LEDs, however they do not play will with having things after them.

The configuration for the LED should also include changing the color.

[arntsonl]

I'll also take this one on

[thomasbaart]

There’s now a bounty of $50 on this request 😌