Fix treetent puzzle editor

[jac-oblong]

Description

Uses the code from #530 to fix the treetent puzzle editor.

Where very simple fixes. There was a switch statement missing "break"s. And the TreeTent puzzle exporter was exporting string values, while the importer expected integers.

Closes #503, #530

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an already existing feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Created a puzzle using the editor and successfully opened it back up.

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[jac-oblong]

Once this is merged, #530 should be closed.

[charlestian23]

The changes you made are fine. I'd prefer if right clicking the numbers in the Tree Tent puzzle editor would decrease the numbers, since right now, right clicking and left clicking both increases them.

[jac-oblong]

Differing between right/left click should work now

[charlestian23]

Changes are good, merging.