to create .bmx-files, your image-data
needs to fit certain criteria:

1. if it's a .gif-file:
   * size:   16x16
   * frames: 4
   see test.gif as an example.

2. if it's a non-.gif-file:
   * size:   16x64
   * 4 tiles need to be concatenated,
     top to bottom.
   see test2.gif as an example.


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