2.6.6.18: update D3, add new option for charts and fix minor bug
- Update to D3 7.2.1 - add option to set threshold for pie, donut and gauge charts #3 - fix bug in custome tooltip in charts #2 - update license to 2022
- Update to D3 7.2.1 - add option to set threshold for pie, donut and gauge charts #3 - fix bug in custome tooltip in charts #2 - update license to 2022