ToDo for JSDSH:
 - Implement FrontEnd (Add Player, etc) ?
 - Background and Wall Editing/Importing
 - on-the-fly-adding of characters
 - traps etc.
 - JSON instead of JavaScript importing
 - second adventure
 - add avatars for players and monsters
 - attack distance
 - Objects: Pass object to initializer
 - Hitbox on "things"
 - Instructions-page