Add some basic tests to tiledit project

[NoxHarmonium]

• Still doing a lot of refactoring too

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.90%. Comparing base (41be0b2) to head (300a35b).

❗ Current head 300a35b differs from pull request most recent head ad0c912

Please upload reports for the commit ad0c912 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #243   +/-   ##
=======================================
  Coverage   66.90%   66.90%           
=======================================
  Files          50       50           
  Lines        5542     5542           
  Branches     5542     5542           
=======================================
  Hits         3708     3708           
  Misses       1736     1736           
  Partials       98       98           

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