jscript: Implement the String.toLowerCase() method.

[Andrew Nguyen]

This is an attempt to implement the String.toLowerCase method. The
added jscript tests pass on Windows XP.
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 dlls/jscript/string.c     |   41 +++++++++++++++++++++++++++++++++++++++--
 dlls/jscript/tests/api.js |   11 +++++++++++
 2 files changed, 50 insertions(+), 2 deletions(-)
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