chore(windows): cleanup old .dof, .bdsproj and .cfg files

Fixes #519.

I have removed these .cfg, .dof, and .bdsproj files from the primary
projects in the Windows source. There is some ambiguity as to whether
.cfg files are used by the command line compiler (I checked with procmon
and they *are* read by dcc32.exe), so we will need to make sure that
no adverse changes have been made by this. In theory at least, the
.dproj data trumps .cfg data -- and all the projects in question have
a .dproj file -- so this should be a safe cleanup.

I have opted not to touch the /buildutils, /ext, /support and
/test folders at this point.