Game updates/20130327

Update - Tuesday March 27, 2013

Adds particles and an icon to make it clearer when the tin foil hat is queuing AI events.
Tin foil hat wearers will no longer mine placed blocks.
Fixes an issue that could cause worlds to fail to load.
Fixes problems with invisible plants, and trees that don't fall down when chopped
Fixes more crash bugs, particularly in multiplayer
Fixes issue that could make button presses fail to work sometimes
Fixes graphical issue with doors and trapdoors in transparent blocks
Fixes problems with very large numbers of sharks or fish spawning
Other minor fixes