Remove unused files.

Refs #4962
Add cmake build files.

Refs #4962
Improve compatibility with ancient versions of Bison.

Refs #4962
Merge branch 'feature/cmake-4962' into next

Fixes #4962
Fix: ASSERT in WorkQueue::Enqueue fails

Refs #4991
Merge branch 'feature/workqueue-assert-4991' into next

Fixes #4991