recreate planetarium repo

[codeanticode]

The original planetarium repo was a fork of the processing-library-template, and I wanted to make it as a stand-alone repo independent of the template. In order to do that, I had to delete and recreate it.

Users who forked the original repo (@AfshinKoupaei, @ErinFinnegan, @imclab, @NMMN, @FH-Potsdam) and want to continue to receive the upstream updates from the new planetarium repo, probably need to delete their fork, and then fork it again. Sorry for the inconvenience!