All operating systems:
- Added collision detection.
- GUI is now usable. Moving around, chatting and building work.
- Now works with NVidia graphics drivers.
- Added working build window.
- Added the possibility to type chat messages while the 3D view is selected.
- New look for tabs window.
- Fixed bug that prevented names from showing up in chat.
- Themed border for chat display.
- Added user id of object owner to the object properties window.

