Refactoring methods, now all leading big caps

include/ITAUPConvolution.h

include/ITAUPFilter.h

include/ITAUPFilterPool.h

include/ITAUPTrigger.h

src/ITADirectConvolutionImpl.cpp

src/ITAUPConvolution.cpp

src/ITAUPFilter.cpp

src/ITAUPFilterPool.cpp