[L2Ork-dev] port of [unpost] from desiredata

[Jonathan Wilkes]

Hi list,

To help with tests, I'm porting [unpost] from matju's abandoned
desiredata. This object can capture messages meant for the Pd console
and redirect them to an outlet:

https://git.purrdata.net/jwilkes/purr-data/merge_requests/253

If you have some time, please test the heck out of it to make sure it
doesn't crash.

See the help patch there to understand how it works.

Best,
Jonathan