Neuroendoscope-igt

functions

1. Interface
   1. Generated a separate image rendering window to display captured endoscope view
   2. Make module with four pages

1. Registration page
   1. interfaces for ICP registration
      1. i/f to select partical surface for ICP (optional)
      2. using tracker (currently using NaviTrack, but IGSTK is preferable)
      3. i/f to give good intial guess
      4. i/f to foot switch

1. Camera page
   1. to control graphics and real endoscope

1. Navigation
   1. view point control