frontend: Make sure all QObject subclasses have Q_OBJECT macro

[cg2121]

Description

Went through and found all QObject subclasses that didn't have a Q_OBJECT macro.

Motivation and Context

#11784 still doesn't compile

How Has This Been Tested?

It compiled

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

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