Implement geometric placement of flyers on ceiling pipes. Next is
stairwell, then done with geometry.

Rather than messing with trig, the easiest thing to do is just compute
start and end points and interpolate. The start and end points require
a little trig, but it's very simple.

Also fixed a bug in which the Layout Tool would have all parameters
modifiable when firsts started (then after you change to a different
flyer they grey out normally). Requires callijng updateEditableParameters
in constructor.

configuration of FFs in front window. Next step: ceiling and
then the stairwell itself.

It seems that the previous version of LXStudio, LXLayers ran after
onDraw, such that the highligher could be added as a layer. It seems
that now they run before, such that clearing everything to black (or
any Patterns) will overwrite the highlighting in a Layer. So I pulled
it to to something explicit in computerFlyerLightsAndWings.

We're just about ready to be able to position the flyers!

Two unknowns:
  - Why is the Layout Tool window in shadow, that changes as you move?
  - Why can't we save the configuration?

Decouple json serialization from Model to IO; Link IO,Model and Engine to load and save configuration; Deletes testModel

Update IO to receive files for saving automation set; tries to configure channels (not working); Updated FlightModel for testing IO