Separate icon styles from GridClassStyle and use it for all icons #951
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This mainly allows changing the icon font used, which was impossible previously due to some icons being hardcoded.
It does this by having a separate IconStyle class hierarchy which is used similar to the normal class style whenever a icon is needed.
I also shortened the common
self.param.grid_class_style.get
toself.get_style
just because i think its much nicer this way.