ARA for Mac

[funkchaser]

Testing ARA on Mac and Rhino 7 reveals following issues:

• server - no terminal window shows up
• open folder (explorer) doesn't work
• plotters in static mode

Will not be investigated or fixed for now:

• RhinoPythonEditor: no module named Grasshopper (sometimes)
• plotters in interactive mode - hangs up (on some machines)
• no Bitmap+ for mac (static mode display doesn't work)

TODO:

• create new release
• adjust documentation

[funkchaser]

Dropped support for plotters in static mode because no Bitmap+ available to display the content. Hence, also no need for kaleido on Mac (see also #42).