mshtml: Added support for coexisting different Gecko versions installation. [resend]

[Jacek Caban]

---
 dlls/mshtml/install.c   |   52 ++++++++++++++++++++++++++++++++--------
 dlls/mshtml/nsembed.c   |   59
+++++++++++++++++++++++++++++++++++-----------
 dlls/mshtml/nsiface.idl |    3 ++
 3 files changed, 89 insertions(+), 25 deletions(-)
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