Plot waveform data besides scalar

[marciodo]

A suggestion: timechart could plot an entire waveform EPICS record in one single shot. Each time the record updates, it would clean the data on the screen and update with the new waveform.

[kabanaty]

Would require a separate chart widget (can't plot waveforms on PyDMTimePlot and can't plot scalars on PyDMWaveformPlot). Perhaps a toggle to switch which chart is displayed? Methods would likely need to be doubled-up to manage both charts.