Add CLI options (#8)

* add cli args --config, --debug and --verbose

load_config() will search for a relevant config file in several dirs

add separate handler methods for mute,unmute and toggle

mapping.toml removed, everything merged into config.toml

* add cli options subsection

* rename event variable to make it clear we're waiting for a stop event (and not some other obs event)

* fix argparse description

* add return None (for type checker)

* fix example in top level docstring

* add shorthand `-c` cli option

.gitignore

@@ -90,6 +90,10 @@ ENV/
 env.bak/
 venv.bak/
 
+# Pipenv
+Pipfile
+Pipfile.lock
+
 # Spyder project settings
 .spyderproject
 .spyproject
@@ -102,3 +106,5 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+test.toml