[ADD #309] Added colors to building point groups and direct elevation image display.
The buildings detection plugin generally was a mix of many things. These things of it were split up into these plutins: - Elevation image export - Points group selector which transforms building groups into a voxel structure and exports it to a triangle mesh. Added features: - Elevation image can be output in a triangle mesh - Elevation image (file and triangle mesh output) and building outline got colored building outline Code style: - Fixed prooblems with documentation (make doc) - Purged last code style (make stylecheck)
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