Move Waveform code to its own major area

Move Waveform code out of Scintillator directory into a new Waveform directory.

No functionality has been changed, just moving code in the directory structure.

One significant change is that the basic Waveform class has been renamed from ScintWaveform to RawWaveform. The containers have been similarly renamed. All configuration files (that I could find) have also been updated, although some user code may need modifications.