Create automated testing regime

[Pietersielie]

Create an automated testing regime using Github Actions if possible. Unity Test Framework provides a framework with which to test things.

• Load whole cube with mask
• save whole mask after paint
  • overwrite mask
  • copy mask
• save subcube with submask
  • new mask
• load whole cube without mask
• save whole mask after paint
  • new mask
• save subcube with submask
  • new mask
• load subcube with mask
• save whole mask after paint
  -overwrite mask
  • copy mask
• save subcube with submask
  • new mask
• load subcube without mask
• save whole mask after paint
  • new mask
• save subcube with submask
  • new mask (edited)

As part of this, create a Google form listing the actions required by a user for complete testing of the UI.