The last features added to the tool 

• There is a browser visor that allows dragging the files so users can decide its order
• Managing multiple maps

• Now it's possible to change map names
• The size of the maps can be changed
• The tileset used in the maps can be changed
• The tool now saves the states between sessions

The actual layer system has been extended by adding as many layers as the user wants. Also the players can set which layers are hidden or not hidden by tapping on the layers checkboxes.