Reorganization of Connectors

[z3dev]

This pull request adds the connectors as a fully exposed seperate module. The goals are:

• Convert to V2 math
• Add test suites for all functionality

Connectors:

• [X] code complete
• [X] tests complete, 100% coverage
• [X] reviewed

[z3dev]

Sadly, this still uses OrthoNormalBasis. I'm thinking that we should kill this soon as possible. There are only two uses now.

• connectors
• reTesselateCoplanarPolygons

I think reTesselateCoplanarPolygons is overly complicated, and should be simplified. The use of to2D and to3D adds another area of imprecision to the point calculations. Maybe a task for later.

That leaves connectors using just getProjectionMatrix and getInverseProjectionMatrix. We could replace OrthoNormalBasis with the small function called toXYPlaneTransforms(). Thoughts?

[z3dev]

I added a new issue to follow up on removing OrthoNormalBasis in next pass. See Issue #184

@kaosat-dev please merge