Moved BluetoothPlugin to __init__.py.

This is for consistency with other plugins, that all have their main
plugin class definition inside of `__init__.py`.

docs/source/conf.py

@@ -191,11 +191,6 @@ texinfo_documents = [
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {'python': ('https://docs.python.org/3', None)}
 
-# -- Options for todo extension ----------------------------------------------
-
-# If true, `todo` and `todoList` produce output, else they produce nothing.
-todo_include_todos = True
-
 autodoc_default_options = {
     'members': True,
     'show-inheritance': True,