MPLWidgets.encode_frames now calls super
MPLWidgets.encode_frames now calls super

Allows implementing encoding/escaping on the baseclass

basnijholt/holoviews,basnijholt/holoviews,vascotenner/holoviews,ioam/holoviews,mjabri/holoviews,mjabri/holoviews,vascotenner/holoviews,basnijholt/holoviews,mjabri/holoviews,vascotenner/holoviews,ioam/holoviews,ioam/holoviews