[flowGL]

• Add supersampling property for supersampling antialiasing.
• Add particleType property. Which can be 'point', 'line'. The animation will look much smoother when particleType is 'line'

[Bug fixes]

• Fix can't find parseGeoJSON method bug. See https://github.com/ecomfe/echarts/issues/7079

[modules]

• Changed to ES6 module.