[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/bug66.d

@@ -0,0 +1,5 @@
+module bug66;
+import std.stdio;
+class Scene { string name() { return "Scene"; } }
+class Group : Scene { this () { } }
+void main() { writefln((new Group).name); }