Feature: Adds Z-Wave Safety Shutoff class of devices & FireAvert shutoff models

[bstewart-cae]

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Type of Change

• WWST Certification Request
  • If this is your first time contributing code:
    • I have reviewed the README.md file
    • I have reviewed the CODE_OF_CONDUCT.md file
    • I have signed the CLA
  • I plan on entering a WWST Certification Request or have entered a request through the WWST Certification console at developer.smartthings.com
• Bug fix
• New feature
• Refactor

Checklist

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have verified my changes by testing with a device or have communicated a plan for testing
• I am adding new behavior, such as adding a sub-driver, and have added and run new unit tests to cover the new behavior

Description of Change

This adds a subdriver for Z-Wave Safety Shutoff devices. These devices may have behavior that is similar to a switch or relay but are unable to be turned on or off based on other factors.

Summary of Completed Tests

Functional testing on both the FireAvert Gas and Electric 120V devices.

[CLAassistant]

All committers have signed the CLA.