Changed Structure: DitheringAlgorithm, LaserCutter and LaserProperty implement the Customizable Interface. Thus Dithering-Algorithms can have Options (and are clonable)

- Deleted useless UnitTests (were interactive anyway)
- LAOS driver uses now floats instead of ints (untested)

Fix: XMLEncoder seems to irgnore inerhited getters and setters, which caused VisiCut to always loose settings on Epilog cutters

Laos: 1. Unidirectional Bitmap Marking. 2. Removed G-Code (not used in any firmware). 3. Added Laos-Native rastermode (still buggy)