Added IrTypeFunction and IrTypeDelegate and eliminated IrDType. This means the Type::ir field can be removed. It's the final part needed for the move to a slightly more sane type system. Now the whole thing just needs to be cleaned up :P

Added -v-cg switch, which right now just prints "codegen: module.name (module/name.d)" to stdout, this can really help figuring out where, in some complex build command, things go wrong.

ir/ir.h

@@ -16,8 +16,9 @@ struct IrBase : Object
     virtual ~IrBase() {}
 };
 
-struct Ir
+class Ir
 {
+public:
     Ir();
 
     void setState(IRState* p)   { irs = p; }