Initial support for lasers

This release adds support for laser projection. Laser fixtures can be defined via GDTF, beams can be rotated via pan and tilt, dimmed, colored and can also be adjusted by zoom. Full documentation is available on the BlenderDMX laser documentation page. Materials of models of default geometries and BlenderDMX fixtures have been adjusted - set to dark material.

• Add initial support for laser projection
• Add Import of GDTF and MVR to Setup panel
• Set materials for models of default fixture files
• Add gMA3 icon to MVR-exchange stations list