[Ldraw-content] Updated LDraw Theme

[Orion Pobursky]

I updated the LDraw theme to use the new Xanthia theme engine provided 
by Postnuke.  What this means is that the theme is fully editable (with 
the notable exception of the stylesheets :-( ).  The left, center and 
right blocks are defined by html+smarty.

I've also established a LDrawXanthiaTest theme for testing.  If you're 
going to tweak the theme, use the test theme before you push your 
changes to the main theme.

-Orion

-- 
We don't stop playing because we grow old;
we grow old because we stop playing
-George Bernard Shaw