Goal is to be able to use the TMX3 lib and to parse the following format:
- extern or intern TSX => one tileset gathers everything in our model
- arbitrary number of layers
- visible attribute of the layer set to 1 if it is to be displayed
- z-index set to some unique value to know the display order for the layers
Goal is to be able to use the TMX3 lib and to parse the following format: