Separate each kind of error and warning.

I distinguish the error and warning in the program in detail, so that my program can accurately capture errors and warnings and give feedback to the user

This PR adds: Errors:

CameraAdjustmentError
InvalidMaskIndexError
InvalidArgumentError
NoMatchExceedsThresholdError
HomographyEstimationError
InvalidContourError
RectanglesNotOverlapError
ResolutionMismatchError
InsufficientImagesError
ImageReadError

Warnings:

IdenticalColorsWarning
ImagesNotFullIncludedWarning

OpenStitching / stitching

Separate each kind of error and warning. #121