Prevent user select of toolbar (#6622)
Prevent user select of toolbar (#6622)

* Add the CSS user-select:none properties to the toolbar and toolbar buttons

* Linter

aavanian/bokeh,aavanian/bokeh,DuCorey/bokeh,philippjfr/bokeh,bokeh/bokeh,ericmjl/bokeh,aavanian/bokeh,bokeh/bokeh,rs2/bokeh,timsnyder/bokeh,aavanian/bokeh,mindriot101/bokeh,stonebig/bokeh,Karel-van-de-Plassche/bokeh,dennisobrien/bokeh,ericmjl/bokeh,mindriot101/bokeh,bokeh/bokeh,mindriot101/bokeh,jakirkham/bokeh,philippjfr/bokeh,dennisobrien/bokeh,stonebig/bokeh,stonebig/bokeh,dennisobrien/bokeh,jakirkham/bokeh,philippjfr/bokeh,rs2/bokeh,aavanian/bokeh,Karel-van-de-Plassche/bokeh,ericmjl/bokeh,timsnyder/bokeh,dennisobrien/bokeh,Karel-van-de-Plassche/bokeh,stonebig/bokeh,Karel-van-de-Plassche/bokeh,timsnyder/bokeh,DuCorey/bokeh,ericmjl/bokeh,timsnyder/bokeh,dennisobrien/bokeh,ericmjl/bokeh,rs2/bokeh,philippjfr/bokeh,jakirkham/bokeh,bokeh/bokeh,DuCorey/bokeh,timsnyder/bokeh,Karel-van-de-Plassche/bokeh,bokeh/bokeh,jakirkham/bokeh,jakirkham/bokeh,rs2/bokeh,rs2/bokeh,DuCorey/bokeh,philippjfr/bokeh,DuCorey/bokeh,mindriot101/bokeh