v0.3.4: Fixed bug in which the Render group panel title did not
        display ‘Spectral Image’ when that image was visible.
Removed an unnecessary log message SLOG(imageAxesComboItemName).
v0.3.4: SettingsPanel.cpp: Fixed spelling error of ‘Fluorescent’ (was ‘Flourescent’).
v0.3.4: CustomControlsPanel.cpp: Fixed spelling error of ‘Currrent Emitter’ (was ‘Currrent Emitter’).