Handling and applying calibration parameters

[ctoennis]

Hello all,

I have a special case for applying calibration: In the case of variance images that will be needed for anything related to star tracking the calibration parameters need to be applied differently to other types of images. As a solution to this i sugest i change the CameraCalibrator component from ctapipe.calib.camera.calibrator to have a new parameter for the method by which the calibration parameters are to be applied and the methods for regular charge images and variance images.

Furthermore EventSource and TableLoader should use the interpolator from PR #2634 to provide the calibration parameters.