breaking: Add Electron build, npm scripts, fix paths for tile-images, Allow different sized maps, Load maps

Trungel added:

• Electron build
• NPM run scripts
• Fixed paths for tile-images, so they should now work with GitHub Pages
• Allowing users to change the size of the map being edited/made
• Loading a map from a string
• Refactored the way the map is generated and rendered in the browser (MVP Award goes to...!)
• ...