multiple bugfixes
Important change - revision button moved up near goal and triggered when
refs are available and also on MCQ's.
1. showgiftdialog - refactoring image sizes matcher
2. screencomponent - added revision button
3. tutoringend dialog - cleanup of description and speaks out
description
4. gesturedetector - logs rotation event which has now become system
event otherwise 
5. parameterprober - prompts revision mode on error
6. tutorgroup - dirty changes to enable mcq revision to work properly