Development release 0.0.3.dev1

Changelog:

• The client can now be opened using a with statement.
• Value downlinks now have get method with optional blocking behaviour.
• Value downlinks now can be closed individually using close() method.
• The client can now send commands using command() method.
• Added specialised Bool class in the swim structure module for handling Boolean values.
• Fixed a bug preventing the rate and priority of Envelopes to be parsed correctly.
• Improved the support for nested structures in messages.
• Removed minor bugs.
• Removed redundant code.
• Increased stability.

Development release 0.0.2.dev2

Initial release focused on setting up the CI/CD process.