Anisotropic filtering introduced.

Graphics is now initialized BEFORE the renderer class instance is
created. This should save as the trouble with unitialized graphics later
on.
Changed the default for Texture filters.
Multisampling enabled (MSAA).

MSAA functionality is now explicitly invoked, although in practice MSAA
is turned on by default.
New terrain model used in test game.
New ant tweak bar type for shadow info object