Added basic rich edit control support for MLEs on Windows. This is disabled by default, I tried switching to the richedit control to work around a problem with the edit control not being able to switch word wrap modes without recreating the control. However despite rich edit messages that look like they will do just that, the rich edit controls appear to have the same problem. Committing this code though in case we want to switch to rich edit in the future for other reasons.

# Set these here to change the version for all platforms
DW_MAJOR_VERSION=2
DW_MINOR_VERSION=2