Feature/multi color

[remcoder]

This implements multi-color previews for 3D printers that can switch filaments / tools via T0,T1,..Tx. (see T0-T7 gcode command info)

Systems that should be supported this way include:

• Prusa MMU1/2/3 & XL
• Bambulabs AMS and AMS Lite
• 3D Chameleon
• Enraged Rabbit Carrot Feeder (ERCF)
• IDEX systems
• Tool change systems
• Color mixing nozzles when used with a 'virtual tool' (M164 - Save Mix)

Systems that are not supported include:

• Mosaic Palette series (I think the way it works is: gcode is transformed using their own tool Chroma and this is interpreted by the Palette).
• Color mixing w/o saving as a virtual tool
• Color gradients - color mixes that change their ratio over time
• Manual filament swap (this relies on the use of gcode M600)

It implements #122

TODO:

• [x] support T0-T3
• [x] support T4-T7
• [ ] decide on API
• [x] add to demo
• [x] decide the gcode processing state handling
• [ ] add unit tests

API : the extrusionColor is allowed to be a Color or an object (Record<number, ColorRepresentation>)

this.extrusionColor = {
   0: new Color(0xff8000),
   1: 'red',
   2: 'rgb(255,255,0)',
   3: 'fff'
 };

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[remcoder]