UI: chartjs migration from 2.9.4 to 4.4.0

[lukasrgr]

This is the start of migrating chartjs to latest version. ~~- [ ] Waiting for rest of the widgets to use new form of generating charts.~~

• Waiting for refactoring of
• [x] timeofUse
• [x] storage

• Using chartjs migration guide x3 and x4

Changes

• Adding ColorUtils
• upgrading ng2-charts to 4.1.1
• upgrading chartjs to 4.4.0
• introducing chartjs-zoom-plugin without activation

• [x] testing

Aiming for PR: #2183