Update ISY994 integration to be model agnostic

[shbatm]

Proposed change

Revises the isy994 integration to be more agnostic to specific UDI model numbers. The "ISY" term is now more broadly associated with Universal Devices' software rather than the legacy ISY994 device. They have also introduced the IoX term to refer to ISY-on-Anything firmware, which runs the control software on their newer Polisy and eisy devices.

1. Change Title from "Universal Devices ISY994" to "Universal Devices ISY/IoX" to reflect new UDI naming.
2. Generalize "ISY994" to "ISY/IoX" where referring to the software and not the specific model number.

At this point, I don't believe it's worth the hassle of changing the integration domain from isy994, simply to avoid breaking changes, but this will help users understand that the integration is for the full ISY family, not just the ISY994 device.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Update ISY994 documentation to be model agnostic home-assistant.io#25514

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @bdraco, mind taking a look at this pull request as it has been labeled with an integration (isy994) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of isy994 can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Change the title of the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign isy994 Removes the current integration label and assignees on the issue, add the integration domain after the command.

[bdraco]

Testing this now

[bdraco]

Thanks @shbatm