New art and bug fixes

Had a fairly busy month with other things, and generally been pretty slack, so not so much to show.
I have implemented new graphics and animations for the character, and added some particle effects to show what colour key a door needs, as can be seen in the screenshots below. Besides that it has mainly been bug fixes with the map generation:

• Player can no longer spawn in rocks
• Rocks can no longer spawn in walls
• Rocks can no longer spawn in other rocks
• Rocks can no longer spawn in positions which would block doors making the map impossible to complete