[svn r104] TONS OF FIXES.

Split up declaration, constant initializer gen and definition for globals, structs, classes and functions.
Improved ClassInfo support (not complete), not in vtable yet.
Fixed a bunch of forward reference problems.
Much more. Major commit! :)

test/bug58.d

@@ -7,4 +7,4 @@ void main()
     arr.sort;
     writefln("arr.sort = ",arr);
     assert(arr == [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]);
-}
+}