Add support for more events

[kevmo314]

Description

This change adds support for obsSceneListChanged, obsTransitionChanged, obsTransitionListChanged events. The event arguments match the signatures of the corresponding getters.

Motivation and Context

Adds additional events for which there are corresponding getters already.

How Has This Been Tested?

Compiled and manually tested.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code has been run through clang-format.
• [x] I have read the contributing document.
• [x] My code is not on the master branch.
• [x] The code has been tested.
• [x] All commit messages are properly formatted and commits squashed where appropriate.
• [x] I have included updates to all appropriate documentation.