mshtml: Added support for coexisting different Gecko versions installation.

[Jacek Caban]

This patch depends on my urlmon patch.

Now paths of Gecko installations are stored in separated keys
HKCU\Software\Wine\MSHTM\<version>
Also an old location is checked for backward compatibility. Gecko is
installed by default in c:\windows\gecko\<version>\.

---
 dlls/mshtml/install.c   |   51 +++++++++++++++++++++++++++++++--------
 dlls/mshtml/nsembed.c   |   59
+++++++++++++++++++++++++++++++++++-----------
 dlls/mshtml/nsiface.idl |    3 ++
 3 files changed, 88 insertions(+), 25 deletions(-)
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