Add support for windows environments

[tomas-polach]

Currently, supported platforms are Linux and OSX.

Windows executable is not yet included since as line support for DXF import is buggy in the current release (0.6.0) and I didn't have the opportunity to compile it from source on a windows machine. The bug has been fixed in the source: SpaceGroupUCL/depthmapX#104

To do, once the next depthmapX CLI version with fixed DXF import is released:

• Add depthmapX CLI bin for windows
• Uncomment https://github.com/archilogic-com/node-depthmapX/blob/master/index.js#L10