Making the app responsive to window manager close commands
Initial addition of spectrogram code

Added to menus, and at least got includes included and compiling
Integrating spectrogram with the rest of the code
Removing vestigal windowlength parameter

It was causing notices, and the spectrogram uses
eof_spectrogram_windowlength instead of this param

Also moving the keyboard shortcut to the m to avoid conflicts
and catching some extra leftover waveform references
Code cleanup, clearing out some debug
Blindly amending the rest of the makefiles

I assume the flags are the same for the other platforms
But have no easy way of testing that