combase: implement WindowsSubstring (try 2)

[Thomas Pointhuber]

---
 .../api-ms-win-core-winrt-string-l1-1-0.spec       |  2 +-
 dlls/combase/combase.spec                          |  2 +-
 dlls/combase/string.c                              | 19 +++++++
 dlls/combase/tests/string.c                        | 65
++++++++++++++++++++++
 include/winerror.h                                 |  1 +
 5 files changed, 87 insertions(+), 2 deletions(-)
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