feat(playout): enhance playout logging (#1495)

Some initial work on modernizing the playout app. This replace any custom logger or
logging based logger with the logging tools from libretime_shared.logging and loguru.

Removed all the thread/function assigned logger (self.logger = ...), as this makes it
part of the logic (passing logger though function args) as it should not.

Of a dedicated logger is required for a specific task, it should use
the create_task_logger function.

- refactor: remove dead code
- refactor: remove py2 specific fix
- feat: remove unused test command
- feat: setup shared cli and logging tools
- feat: replace logging with loguru
- feat: setup shared cli and logging tools for notify
- fix: warn method deos not exist
- feat: make cli setup the entrypoint
- fix: install shared modules globally in production
  use extra_requires to load local packages in dev environement
- feat: configure log path in systemd service
- feat: default behavior is to log to console only
- feat: create log dir during install
- chore: add comment
- fix: don't create useless dir in install
- fix: move notify logs to /var/log/libretime dir
- fix: update setup_logger attrs
- style: linting
- fix: replace verbosity flag with log-level flag
- feat: use shared logging tool in liquidsoap
- fix: pass logger down to api client
- feat: allow custom log_filepath in liquidsoap config
- chore: add pylintrc to playout
- refactor: fix pylint errors
- feat: set liquidsoap log filepath in systemd service
- fix: missing setup entrypoint update

BREAKING CHANGE: for playout and liquidsoap the default log file path changed to None
and will only log to the console when developing / testing. Unless you are running the
app as a systemd service (production) the default logs filepaths changed:
from "/var/log/airtime/pypo/pypo.log" to "/var/log/libretime/playout.log" and
from "/var/log/airtime/pypo-liquidsoap/ls_script.log" to "/var/log/libretime/liquidsoap.log"

BREAKING CHANGE: for playout-notify the default log file path changed
from "/var/log/airtime/pypo/notify.log" to "/var/log/libretime/playout-notify.log"

playout/install/systemd/libretime-playout.service

@@ -3,6 +3,8 @@ Description=Libretime Playout Service
 After=network-online.target
 
 [Service]
+Environment=LIBRETIME_LOG_FILEPATH=/var/log/libretime/playout.log
+
 ExecStart=/usr/local/bin/libretime-playout
 User=libretime-pypo
 Group=libretime-pypo