[Bf-python] Add the Hotkey-Search script into trunk.

[易丹阳]

Any one else can help us to Add the
http://projects.blender.org/tracker/?func=detail&aid=34059&group_id=9&atid=127into
trunk Please.

Context:
http://blenderartists.org/forum/showthread.php?280155-Allow-hotkey-filter-Search-the-hotkey-Exist-or-not-Preferences-Input-Filter&p=2299653


Thanks!
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