plugins/fmcomms2: waveform load auto determine TX mode
osc: add basic test waveforms
oscplot.c: make it easier for the red/green colour blind people to see markers
all: Make FFT markers indicate things in absolute frequency
oscplot.c: Markers are actually dB Full Scale (dBFS), not just dB.
oscplot.c: add another decimal point to markers
oscplot.c: Fix bug: The plot was being cleaned up while saving settings in FMcomms2 plugin.(capture button not activated)