ENH: always be case sensitive when matching node names with fnmatch

when using fnmatch.fnmatch the case sensitivity depends on the
filesystem [1]. For matching used when finding slicer nodes and
qt widgets this variability does not make sense and may introduce
cross-platform bugs. So we use fnmatch.fnmatchcase to ensure
the same behavior across platfroms.

https://docs.python.org/2/library/fnmatch.html

http://slicer-users.65878.n3.nabble.com/Capturing-mouse-events-tt4029365.html#none

From: Steve Pieper <pieper@bwh.harvard.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24589 3bd1e089-480b-0410-8dfb-8563597acbee