Implement Conversion of .obj files to .geojson

[Jojohannes87]

PROJECT: qua-server
CHANGESET: Upload, conversion and adjustment of 3D object files
DESCRIPTION: To make qua-kit useful for architects and designers, there must be a link between their tools and qua-kit. SketchUp is commonly used among designers for creating and editing design sketches. An export to .obj files (3D objects files) is possible, luci allows the conversion to .geojson. Nevertheless is the workflow via the blender add-on quite inconvenient. I think of an upload option for .obj files that will be converted .geojson and (quite important) could be scaled correctly (e.g. by typing in either the height (in m) or width or length of the object).