Updated earth wizard animations
Renamed wizards images filenames
Renamed wizards images filenames. Added wz_ prefix
Updated html title
Replaced change spell with stone spell
Path spell starts from current player position.

Fix: Path was not lightened the right way after player cancels
spell casting.
Change: Current player pos. is now also lighted
Updated GUI buttons
Replaced footer image
Replaced wizard selection images on main menu
Adjusted positions of menu wizard images
Added placeholder for AI
Added game how-to. Initial version.
Updated earth wiz walking animation
Fixed decl. typo