New Clips Should Match the Clip Snapping Size

### Problem Description
When a new clip is created in a track, it has a default size of one bar, regardless of what the user has set the clip snapping size of the project to.

### Solution
Each new clip should instead be created with the clip snapping size instead. Implementing this adjustment will help the general feel and workflow for users when creating clips in their project.

Review the existing open pull request #8267 first, since work is already underway. Then locate the code that creates new clips and the project's clip snapping size setting; done means newly created clips use the configured snapping size rather than always defaulting to one bar.

Written by the indexing model from the issue text.