Hi, I'm wondering whether I should be writing my own plugins for GSAP. I have two cases where this might be nice:   1) First I'm animating richmarkers on google maps. To animate latitude and longitude I must call setPosition. I can do this ok with onUpdate, but then if I'm also animating color, say, it starts to get a bit cumbersome. 2) In another project I'm using fabric.js. I notice you have a plugin for easel.js but not fabric.   So for cases like this should I write my own plugin to m