This patch improves the bluetooth profile autoswitch so that it works with any
application that wants to capture from a bluetooth device. To do so, a loopback
source filter is created per connected bluetooth device. If an application wants
to capture audio from such loopback source filter, the profile in the associated
bluetooth device is changed to HSP/HFP. If there isn't any application connected
to the loopback source filter, the profile switches back to A2DP.
* prefix all settings with just "linking."
* rename settings to make more sense
* fix the handling of the "follow" setting
* move the "move" handler to the rescan.lua script, as it's just a rescan hook
When set to 'true', the node will remain alive without any error produced if
it cannot be linked to its specified target; in all other cases, an error will
be produced and the node will be destroyed.
I don't fully remember where this originates from, but it looks like
some sort of hack to workaround a race condition where the event handler
would try to iterate over items that were just created and were not yet
fully ready to be used.
