fix: Correctly write view radius and center to map JSON. Fix typo in initialViewCenterX in JSON. Fixes issue #32

refactor: Set width of filefield to max. Add tooltips for various parts. Implement more checks for chosen file and notifications on rejection.

Implemented Load From File

feat: Allow setting of initialViewRadius and initialViewCenter, color and opacity of scrollthumbs, Add button with about info

feat: Tile images! Instead of colours, we now display an image of what the tiles actually look like in-game!