* Also improve BBText performance when rendered in the scene editor.
Don't show the rest in changelog:
* This was due to the font measurement being incorrectly done by Pixi.js because the font family was having a dot in its name. It should have been quoted but for some reason is not. Instead, ensure all font family names are slugified so we don't risk such incompatibilities in the future.
* Also rework deprecated text object font handling to entirely avoid having to declare the font families at the export time.
Fix#1521
Florian Rival