Adds a script to generate the json file that contains the data.
Adds a way of visualizing the evolution of the map (moves). This is achieved by doing diffs between the current version of the map and each previous version.
All the diffs are returned client side in the json file (the purpose is to avoid loading all the maps which would be bandwidth consuming), and the javascript patches the current map to obtain the previous maps.
The diffs need to be generated before commiting or just after deploying. The script "generate-json.js" (which requires node.js) generates those diffs. This script must be edited to include all the maps
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