Remove unused recorder fragments. #59

config/sample-development.engine.ini

config/sample-docker.engine.ini

config/sample-production.engine.ini

docs/engine-features.md

src/core/client/connector.py

src/core/client/playerclient.py

src/liquidsoap/archive/unused_fallback.liq

src/liquidsoap/archive/unused_out_filesystem.liq

src/liquidsoap/archive/unused_record.liq

src/liquidsoap/archive/unused_recorder.liq

src/liquidsoap/archive/unused_stream.liq

src/liquidsoap/engine.liq

src/liquidsoap/library.liq

src/liquidsoap/serverfunctions.liq

src/liquidsoap/settings.liq