Integration library refactoring and automated release preparations

[zehnm]

This pull request prepares automatic releases and changelogs in the future.

Included features & changes:

• Using common integrations.library for YIO plugin interfaces and common models.
• Added GitHub actions:
  • Verify code quality
  • Build integration library for RPi0, Linux, macOS and Windows.
• Added Qt plugin metadata
• Integration plugin version determined from Git version tag
  • Based on git describe to get exact version if hash relates to version tag, or with suffix containing number of commits since last release and short commit hash of last commit.
• Various fixes and improvements

After this pull request is merged:

• the develop branch will be deleted.
• the workflow will be changed from git flow to the simpler GitHub flow.
• a pre-release is automatically being created for each push on the master branch by a GitHub action.
• a release is automatically being created for each tag pushed to the master branch by a GitHub action.