Deleting a waypoint does not mark path as modified and offer to save

[natejank]

Describe the bug
When a waypoint of a path is deleted and the path is otherwise unmodified, the program will not prompt to save the new path. If I then build paths, the program will not prompt to save the updated path, and the old path will be built.

To Reproduce
Steps to reproduce the behavior:

1. Create a path
2. Save it
3. Close and reopen the program
4. Load the path
5. right click a waypoint -> Delete
6. Click another path or click "Build Paths"

Expected behavior
Upon deleting a waypoint, pathweaver should recognize the path as modified and ask to save the updated path when switching to a different path or building.

Desktop (please complete the following information):

• OS: Windows 10 21H2
• Java version: OpenJDK 11.0.1 (or whatever version is run when pathweaver is run through WPILib VSCode)
• WPILib/Pathweaver version: 2022.3.1