Hubitatmaker

Add a constant for the `flash` command

Fix a typo in a color mode constant. (jason0x43/hacs-hubitat85, jason0x43/hacs-hubitat72)

Create and close an aiohttp connection for every request to prevent resource leakage.

This release fixes an issue where the event URL couldn't be set back to the default value on an existing hub instance.

This release adds several new features:

- The hub's event POST URL may now be manually set (7)
- Hubitat modes are now supported (4). The current mode is loaded at startup and updated as mode events are received, and the mode can be set.
- Hubitat's HSM functionality is now supported (3). The current HSM state is loaded at startup and updated as HSM events are received, and the HSM state can be set.

There is also a bug fix:

- Non-device events are no longer emitted to device listeners (6)

This release improves support for RGB light devices.