shlwapi: Implement PathUnExpandEnvStrings (try2)

[Nikolay Sivov]

try2: more tests, now includes tests for altered variables, and multiple
string occurrences within given path.
---
 dlls/shlwapi/path.c       | 117 ++++++++++++++++++++++++++++++++++++---
 dlls/shlwapi/tests/path.c | 136 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 243 insertions(+), 10 deletions(-)


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