mshtml: Added handling of right and left arrow keys in editing mode.

[Jacek Caban]

---
  dlls/mshtml/editor.c         |  203 
++++++++++++++++++++++++++++++++++++++++++
  dlls/mshtml/mshtml_private.h |    4 +
  dlls/mshtml/nsembed.c        |   70 ++++++++++++++-
  dlls/mshtml/nsiface.idl      |   40 ++++++++-
  4 files changed, 315 insertions(+), 2 deletions(-)
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