Added improved default style settings for Spline, Text and Arrow
Added improved default style settings for Spline, Text and Arrow

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