[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/bug63.d

@@ -0,0 +1,10 @@
+module bug63;
+
+void main()
+{
+    static void notnested()
+    {
+        printf("hello world\n");
+    }
+    notnested();
+}