Added on_property method to get_point and set_point.

[davidraker]

Replaced and extended broken functionality to get_priortity_array on get_point. Added ability to set different properties on points than are configured in registry.

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Has been tested by getting and setting additional properties on real bacnet devices.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[craig8]

@davidraker please add a test for this. Because it is a breaking change in bacnet interface, I need a little more understanding on it. Perhaps we can look at it together.