WED: Better preview

The textures for terrains and sprites are visible in the 3D view. Models are rendered as solid monochrome objects.

WED: New Texture properties

Surface textures can now be automatically aligned using the following buttons:

Reset - resets the texture;
L - Align texture to the left;
R - Align texture to the right;
F - Fit Texture;
T - Align texture to the top;
B - Align texture to the bottom;
C - Center Texture;

WED: Light and sound ranges

When selecting a light or a sound source, it's range is now indicated by a circle in the 2D views.