combase: implement WindowsSubstring

[Thomas Pointhuber]

that's my first patch to wine, so I have only implemented the function WindowsSubstring, using documentation which I found online.

Because I have no Windows 8 to compare my implementation with the original dll, I'm looking forward someone would do it for me.

thx, Thomas Pointhuber

---
 .../api-ms-win-core-winrt-string-l1-1-0.spec       |  2 +-
 dlls/combase/combase.spec                          |  2 +-
 dlls/combase/string.c                              | 25 +++++++++
 dlls/combase/tests/string.c                        | 64 ++++++++++++++++++++++
 include/winerror.h                                 |  1 +
 5 files changed, 92 insertions(+), 2 deletions(-)

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