input arg that feeds into plot_params.show_formants

[cwnaber]

Add new functionality to allow user to toggle formants off from the start when launching audioGUI.

This was previously requested by Robin for one of her studies (where they weren't helpful during segmentation and obscured the view of the spectrogram). I also want to use this for segmentation practice I'm setting up for new students, for similar reasons.

This change should be merged at the same time as another change to wave_viewer: https://github.com/blab-lab/wave_viewer/pull/5

[cwnaber]

Carrie, please re-review.

New commit:

• Changed field name from show_formants -> yes_show_formants
• audioGUI uses varargin to arbitrarily set field names in plot_params
  • Does not check if the field name being supplied to plot_params will do anything.

Testing

• Tested 1-4 values in varargin
  • Helpful error if odd number of varargin values. (It needs pairs of field name + value)
• Tested old datasets that hadn't need the new code
• Tested with brand new datasets
• Tested with made up field names. Nothing bad happened.

Note: The current fourth input param figpos could be removed and set via varargin with the new functionality. But changing the order of input args would break legacy code. I don't plan to do this right now.

[cwnaber]

@carrien Tested and works without parsing varargin. Please approve so I can merge.