Version 1.2.0

This time I added a bit of user facing functionality in the form of:

a logging facility which you can control using the --level argument,
a new flag --daemon to fork into a background process,
a sample config which you'll be able to find under /usr/share/doc/mpdris/sample.mpDris.conf if you use the AUR package

Changelog

Add a logging facility
- Add new command line argument --level to control logging verbosity
Add functionality to fork into a daemon
- Add new command line argument --daemon to fork into a background process upon lanuch
Add a sample config
add shell expansion for the music_directory value in the config
Fix a data race when reloading the config using SIGHUP
Add a lower bound to the set_volume function
Add two helper functions to create the metadata in the Player interface
Add a new util module and move some functions and modules there
Add format and lint jobs to build workflow

Full Changelog: v1.1.1...v1.2.0