Improved structure for further extension.

src/models/__init__.py

src/rest/__init__.py

src/rest/__main__.py

src/rest/controllers/__init__.py

src/rest/controllers/authorization_controller.py

src/rest/controllers/internal_controller.py

src/rest/controllers/public_controller.py

src/rest/encoder.py

src/rest/models/__init__.py

src/rest/models/base_model_.py

src/rest/models/health_info.py

src/rest/models/play_log_entry.py

src/rest/models/playlist.py

src/rest/models/playlist_entry.py

src/rest/models/status_entry.py

src/rest/swagger/swagger.yaml

src/rest/test/__init__.py

src/rest/test/test_internal_controller.py

src/rest/test/test_public_controller.py

src/rest/util.py