Change primary scaling option to an enumerated DWORD, and add custom X and Y scale floats.
Replace AllColorDepths option with bitmapped AddColorDepths, deprecate old variable.
Replace ExtraModes option with bitmapped AddModes, deprecate old variable.
Remove vsync option descriptions as it is not yet implemented.
No new options are implemented yet within ddraw.dll or new DXGLCFG.
Deprecate old DXGLCFG.  Will likely be removed in next release.

git-svn-id: https://www.williamfeely.info/svn/dxgl@567 8a90861a-4eca-46d5-b744-240ff16d0c4d