cache DOMParser instance on svg utils module object
cache DOMParser instance on svg utils module object

- to not have to instantiate one on every appendSVG call

etpinard/plotly.js,iongroup/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,iongroup/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,iongroup/plotly.js,plotly/plotly.js,aburato/plotly.js,aburato/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,plotly/plotly.js