Profanity: silence long-term tolerated MATLAB warnings (%#ok)
Changed the spectrogram display into a toggleable mode

This is easier to handle and works with practically no UI glitches.
Small correction in input verification on zoom callback action
Moved playback's play callback further down (beautifying)
Small corrections and bugfixes. Even colormap depth works again. Yay!
Merge branch 'feature/rebuild-spectr-algorithm' into develop
Implemented reworked spectr/wavef toggle and fixed colormap depth.
Merge branch 'release/0.34'