Refactor dungeon & jsdocs everywhere

[oskarrough]

These are the concepts that concern the "map":

• dungeon (wraps it all together and makes it navigatable)
• graph (a 2D map)
• path (a list of y/x moves through the nodes, from top to bottom)
• floors (a row of positions on the map)
• nodes (a position on the map)
• rooms (where monsters live)
• monsters (what you fight)
• map (the ui)

This PR moves the files and methods a bit around. And made a bit of the generatePaths logic nicer.

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