Alpha release 1.0.0-alpha

Changelog:

• Added event downlinks.
• Added map downlinks.
• Added Unlinked Response handling with appropriate warnings.
• Removed the asyncio Executor and added better support for regular functions in the downlink callbacks.
• Added blocking flag for set method of downlinks, which will ensure the order of set requests.
• Downlinks to existing connections now display the value of the remote lane when opened.
• Minor bug fixes for internal status handling of the client, downlinks and connections.
• Increased unit test coverage to 100% and added missing documentation.
• Formalised the puclic API of the package.