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* Fix api_path handling to be compatible with more recent hawkBit versions
(failed with '500: Server Error' before)
* Update to aiohttp 3.3.2 to improve timeout handling (by Livio Bieri)
* Significant speed improvements by reading maximum of available data instead
of using fixed chunk sizes (by Livio Bieri)
* Prefer https [download] over http [download-http] (by Livio Bieri)
* minor cleanups and documentation fixes