-delegating keyboard event processing to SpotIt class, rather than handling that in main.cpp
-colorSchemes are persistent and managed as members of SpotIt class
-last successful set of pointClusters is saved in SpotIt, and can be serialized by pressing the 'c' or 'C' key to the file 'pointClusters.xml'
when leftMouse-button is pressed on the roi-overlay image at top-left of the window,
select the nearest cluster and print the color-name of the cluster

kgGeometricHashing.hpp - removing unused variables
main.cpp- wiring mouse-handling infrastructure
spotIt.cpp - to reduce spurious keyboard handling getting triggered, after a succesful keyboard handling, handling function vector is cleared
serialization of pointClusters: added more fields for grading
code formatting