recording is now part of engine.liq. a redefinition of the recorded source is needed if those two should be separated.

Origin/aura into master

See merge request autoradio/engine!2

This reverts commit 62a8c7ba, reversing
changes made to a9c94736.

# Conflicts:
#   libraries/database/broadcasts.py
#   libraries/security/user.py
#   libraries/security/whitelist.py