ENH: Update CTK to ensure ctkErrorLogContext is available from python

From python, it is now possible to execute the following:

errorLogModel = slicer.app.errorLogModel()
errorLogModel.addEntry(qt.QDateTime.currentDateTime(), \
  slicer.app.applicationPid(), \
  ctk.ctkErrorLogLevel.Debug, \
  "Python", \
  ctk.ctkErrorLogContext("This is a message"), \
  "This is a message")


$ git shortlog 42700cf..0d2a634 --no-merges
Jean-Christophe Fillion-Robin (1):
      Add PythonQt decorator for ctkErrorLogContext

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23822 3bd1e089-480b-0410-8dfb-8563597acbee