Remove Tiled .tmx support

Luke Bensteadrequested to merge
remove-tmx-support into master

Summary of Changes Introduced

  • Removed Tiled .tmx file loading

Rationale:

This is part of streamlining Simulant. It's easy enough to roll your own .tmx loader, and shipping one just means extra maintenance, and slower builds.

PR Checklist

  • I have documented any user-visible changes to the code in the documentation folder
  • I agree that the changes introduced in this PR are licensed under the LGPL-3.0 license (Why?)
  • I have added applicable tests, or at least not introduced any failures

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