User manual

HSI layers - quads with compass and all marks stacked on each other and using same rotation
axis
New lights - quads under SWITCH node
Various mechanical ADI / HSI flags - same as lights, under SWITCH nodes
Digital rolling readouts - cylinder with 10 sections for each number from 0 to 9 with initial
position to show 0
Not all instruments are modeled yet, however there are plans to implement them all.
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