Scrap Dungeon V0.2 - Procedurally generated maps

Still far from a finished version, but there are huge changes in this version:

• Dungeons are procedurally generated on entering
• Up to 7 floors to explore (but 6th and 7th are mostly empty)
• New monsters on floors 4 and 5
• Inventory now working. Items can be dropped to make space. There is still no use for items beside mirror fragments
• Remapped keys and added a 'How to play' page in-game
• Updated Menus and game UI
• Being defeated restarts the game from home instead of stopping the game
• Going back home restores health, and makes mirror fragments vanish (they have to be collected again)

Some known issues:

• It is technically possible to reach floor 7, but it is not practically possible due to fast enemies pursuing the player and limited health
• Floors 4 and 5 may take many seconds to generate, up to 10 seconds or more. The procedure for these floors needs to be reworked.
• Sometimes the paths to a room in the dungeon may be blocked with no way to explore further, especially on floors 1-3
• Mouse's scrolling wheel is read as a click