Style: Lint Docstrings in `src` using Flake8 #111

.flake8

src/aura_engine/app.py

src/aura_engine/base/api.py

src/aura_engine/base/config.py

src/aura_engine/base/exceptions.py

src/aura_engine/base/logger.py

src/aura_engine/base/utils.py

src/aura_engine/channels.py

src/aura_engine/control.py

src/aura_engine/engine.py

src/aura_engine/events.py

src/aura_engine/mixer.py

src/aura_engine/plugins/clock.py

src/aura_engine/plugins/mailer.py

src/aura_engine/plugins/monitor.py

src/aura_engine/resources.py

src/aura_engine/scheduling/api.py

src/aura_engine/scheduling/models.py

src/aura_engine/scheduling/programme.py

src/aura_engine/scheduling/scheduler.py