No RichEdit20A window class

[Mike McCormack]

James Hawkins wrote:
> I just want to make sure I've got this right.  So we need to implement
> riched20, and then forward requests from riched32 to riched20 because
> riched20 supercedes riched32?

Right. The current implementation of riched32 is Wrong(tm).

We'll implement riched20 from scratch and do it the right way.  When 
it's good enough, we can then rewrite riched32 to use the riched20 
control instead of the edit control.

All that can be done in small incremental improvements, which is the key 
to making cooperative development work.

Mike