Gridfinder Implementation

Background When playing Role Playing Games (like Dungeons & Dragons) on a Virtual Tabletop (like Roll20). You often want to configure a grid for the map. This allows measuring distances and allowing players to snap to the grid. It can also make drawing virtual walls and doors easier. Furthermore I often like to use premade maps such as those posted to https://battlemaps.reddit.com. While it can be difficult to find a premade map that fits your story perfectly I find that adjusting my story sligh...

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