Added the first camera but set it as a Constant Parameter
cleaning a bit the code (I need to still move everything to a class)
Added Markers class
Move cost functions to the header cost_funstions.h
Moved findChessboardPose to chessboard.h|cpp
Initial version of Optimization class (almost empty)
Moved getCheckboardSize
Added getCameraModels, getMeasurements, findCbPoses, getFrameNames
Added View class (container of all the information)