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UI, Placement, and Data Model updates

See merge request !16

Merge branch 'dev/engine-ashley' of code.stanford.edu:plevis/ee185 into dev/pal

This introduces a dependency between the Engine and Processing;
the Engine uses Processing's 3D Matrices to compute positions.
We may want to transition to Java3D or another approach.
It looks like Java3D requires a separate download, though,
so that would be one more dependency.

This was necessary to be able to support moving the wings
The prior approach was relying on static variables in order to
invoke the super() constructor of LXModel in LXModel subclasses.
The constructor takes the sub-models. This is a problem if you want
to build top down (create a Flight, whcih creates Flyers, which
creates Wings, which creates Points), as the lower level has to
exist when you instantiated the higher one. That is, to call

super(LXModel[] children)

in the WingModel, for example, you need all of the children
models created already. But you are in the first line of the
constructor, so it is hard to do so. The prior design relied
on static variables to achieve this, but this as the problem
that then every Flyer has the same wings -- you can't move them
individually (since Wings are static variables).

This PR refactors the data model so it's built bottom up. THis
happens in Model. First it builds the LightPoints, then the
Wings, then the Flyers, then the Flight.

The Fade test pattern now also moves the wings. Take a look.

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.

updated the models to be subclasses of LXModel and LXPoint, integrate with the UI, wrote a test pattern

Merge branch 'dev/engine-ashley' into 'master'

Dev/engine ashley

See merge request plevis/ee185!15