Missing PROGRESS_CANCEL and friends

[wldevries]

Sorry if this is incorrect, but while trying to get CopyFileEx working with CsWin32 in .NET it seemed the constants (enum actually) values PROGRESS_CANCEL, PROGRESS_CONTINUE, PROGRESS_QUIET and PROGRESS_STOP are missing.

This issue was created by following the guidance at microsoft/CsWin32#22

https://docs.microsoft.com/en-us/windows/win32/api/winbase/nc-winbase-lpprogress_routine

[mikebattista]

Thanks for providing these. We do have some work to do to round out the enum support. We will ensure these are addressed.