OOTB: Port existing settings models to Settings Extensions

[cbgbt]

This serves as a tracking issue for the effort to port all settings models to settings extensions.

As per the settings extension design, existing settings models must be ported to installable settings extensions.

For each model, this involves:

• Creating an extension that encapsulates the behavior of the model using the settings SDK
• Replacing the current model with a library reference to the new extension
• Creating an RPM package that can install the settings extension binary

Includes

• [x] #3649
• [ ] #3650
• [x] #3651
• [ ] #3652
• [x] #3653
• [ ] #3654
• [x] #3655
• [x] #3656
• [x] #3657
• [x] #3658
• [x] #3659
• [x] #3660
• [x] #3661
• [x] #3662
• [ ] #3663
• [ ] #3664
• [ ] #3665
• [ ] #3666

[webern]

This is a tracking issue that shouldn't be closed until all of the sub-tasks are done. Re-opening.