Some refactoring: projector calibration now has its own class. Makes testApp file shorter, easier to work with, and opens the door to working with multiple projectors in one application.Then the reference to 'proj' in testApp.cpp will change to 'currentProj' for all actions related to calibration. We will have a list of projectors, and a configuration which specifies in which viewport they should render. Also moved control-panel code to mainControlPanel.h: testApp.cpp becomes easier to work with. In the future we will probably have multiple control panels on the main GUI screen (as opposed to the projector screens), one for each active effect, and it's good to have a structure that makes this easy.