Ycad - Java CAD library SVN Repo

Redo for 3D.

1) Add 3D transform and use vport.
2) Redo matrix code.
3) Add drawCross().
4) Change drawing of indicators and extent lines.
5) Draw box around limit and vport area.

Change use of scale variable.

1) Default xtruDir to (0,0,1).
2) Add 3D transform.

1) Limited use of vport.
2) Implement POINT.
3) Change drawing of indicators.

Change drawing of debug indicators and extent lines.

Add POINT keyword.

Add test function (for 3D transform development).

1) Add test button.
2) Limited use of VPORT - change variable name.

Initial revision