Add prototype of OpLog + EvolutionLog

[MattFerraro]

This is a first pass at implementing the OpLog and EvolutionLog notionally described here

It doesn't really break or change anything as is, but it would allow us to eventually deprecate Messages entirely and serve as the foundation of version control for CADmium

When you run cargo run you should get a nice git log style display:

Root:
* e9fe56: Create: Hello World
* 4f66a9: CreateWorkspace: Workbench 1
* ad71cb: SetWorkspaceName: 4f66a9 'Main Workbench'
* c7f346: CreatePlane: 4f66a9 the top plane
* bee7c6: SetPlaneName: c7f346 'Top'
* 81ea01: SetPlane: c7f346
* f54c1a: CreateRealPlane: c7f346 RealPlane { plane: Plane { origin: Point3 { x: 0.0, y: 0.0, z: 0.0, hidden: false }, primary: Vector3 { x: 1.0, y: 0.0, z: 0.0 }, secondary: Vector3 { x: 0.0, y: 1.0, z: 0.0 }, tertiary: Vector3 { x: 0.0, y: 0.0, z: 1.0 } }, name: "c7f346c93d1f000800dc854f1a44e84032bbac1a8587441fde39ec928e3417ac", width: 90.0, height: 60.0 }
* 585663: CreateSketch: 4f66a9 top sketch
* 47c5d1: SetSketchName: 585663 'Original Sketch'
* fdc492: SetSketchPlane: 585663 f54c1a
* 37177d: AddSketchLine: 585663 (0, 0) to (0, 100)
* 2206a9: AddSketchLine: 585663 (0, 100) to (100, 100)
* 33c267: AddSketchLine: 585663 (100, 100) to (100, 0)
* e3a3e2: AddSketchLine: 585663 (100, 0) to (0, 0)
* 7b490b: CreateRealSketch: 585663 "(1, Point3 { x: 0.0, y: 0.0, z: 0.0, hidden: false })(2, Point3 { x: 0.0, y: 100.0, z: 0.0, hidden: false })(3, Point3 { x: 100.0, y: 100.0, z: 0.0, hidden: false })(4, Point3 { x: 100.0, y: 0.0, z: 0.0, hidden: false })"
* b01534: CreateExtrusion: 4f66a9 first extrusion
* ff4f84: SetExtrusionName: b01534 'Extrude1'
* dd7d1d: SetExtrusionDepth: b01534 100
* c63a96: SetExtrusionSketch: b01534 7b490b
* 7f7210: SetExtrusionFaces: b01534 0
* a7d410: CreateSolid: Extrude1:0 Volume: 1000000.0
* ee963d: CreateTruckFace: 4f66a9 a7d410 lengths: [4]
* ecb0d5: CreateTruckFace: 4f66a9 ee963d lengths: [4]
* 9b9148: CreateTruckFace: 4f66a9 ecb0d5 lengths: [4]
* 76486d: CreateTruckFace: 4f66a9 9b9148 lengths: [4]
* 81b21c: CreateTruckFace: 4f66a9 76486d lengths: [4]
* 5014f0: CreateTruckFace: 4f66a9 81b21c lengths: [4]

And you should be able to see a nice first_solid.obj on disk, which should be a simple cube

[MattFerraro]

All the stuff with CommitNode is because I have never used an Rc in my life and at this point I'm too scared to ask

[MattFerraro]

Closing because this work has been superseded by @dzervas