Added vendor files.
Added "blender factory settings" minimal example.
Trees example has a number of "trees" at random points, showing layout, etc.
Removed vec() in lieu of .set()
Commented ctor, added autostart, expose controls.
Added forest.
Expose trunk on Tree object
Show 500 pointy trees.
Point camera at origin, so box is visible.
Added Physics examples.
Clean up for presentation.
Describe examples in README.