Changes:

• implemented /gamemode, /splash, /dump, /explode, /explode_s, /time and /usage commands
• fixed buttons in the level creation screen acting as they were clicked despite the user not clicking them
• chat messages are no longer drawn when a UI is displayed
• the Chat screen now automatically enables the type box when the slash key is pressed
• enabling or disabling the Chat type box goes back to the end of the chat list
• levels are sorted by last played
• better explosions. They were supposed to be circle-shaped, but they are square-shaped instead. Sorry!
• entities get shaded properly