Pyinsteon

Enable the ability to clear a radio button setting
Fix tools function for aldb -> add_device_to_scene
Fix tools function for aldb -> advanced -> find_broken_links
Fix KPL ability to set multiple toggle button settings before writing to device
Fix issue with reading an empty ALDB
Drop support for Python 3.5

Addresses the following changes:
- Enable read-only operating flags and extended properties
- Change LED_ON property to LED_OFF
- Add a docker dev environment
- Add support for python3.9

Addresses the following updates:
- Ensure proper handling of device cat as an HexIntEnum, not an int
- Use firmware to decide properties (ToggleLinc)
- Reset changed value for all flags when new_value set to None
- Send notifications when the ALDB status changes or a record is added
- Toggle and radio button changes should not write directly to device
- Handle toggle and radio buttons when props not loaded
- Bump pyserial-asyncio to >=0.5 for python 3.8 compatibility
- Ensure proper hex translation

Fix status message:
- requests only responding to DirectACK
- IOLinc displays the wrong status
- OnOff Outlet displays the wrong status for bottom outlet

Improve ALDB updates
Fix issue writing to ALDB when not loaded

Fixes issue with on/off events not firing correctly.

Increase Hub read/write timeout to 5 minutes