Drawj2d 0.8.2 released

This release introduces blocks.
The feature eases inserting part drawings from a library. A block can be rotated without influencing the main coordinate system.

Changes:
- new commands for inserts: block, endblock, block.rotate, block.flip, block.scale
- new command geom.azimuth
- new command opacity. Output modes screen and png only.
- command text: style name block removed (use justify instead)