move local/panel configurations out of the pyoperant repo

[neuromusic]

the whole package requires local "panels" to be defined. currently, these are defined in local.py

however, this requires modification of the repo which isn't very helpful for distribution.

instead, I propose that we move any local configuration to a hidden folder in the user's home directory (e.g. /home/user/.pyoperant)

we should see how jupyter, phy, and others do this exactly

[siriuslee]

This would be great. I'm not sure I have any insight yet on what the best way to do this is, but currently I've just added a separate directory to the repo that is only for our lab and will just be keeping an upstream branch updated to this repo's master. That's not a super clean solution, but it does work well when you have custom Behavior classes.