spa: bluez: port many things to spa_auto*
See the commit message for the details. The main advantages include:
- shorter code;
- resource management is more robust against future changes;
- some potential resource leaks are eliminated.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
See the commit message for the details. The main advantages include: