fix extrema cannot display correctly when there are multiple values with same step in scalar page (#981)

* chore: update dependencies

* fix(scalar): cannot display minmax values when more then 1 point in same step

* chore: update snowpack to 3.0

* chore: update snowpack to 3.0

* chore: complete license

* chore: fix typo

* chore: window instead of globalThis to support more browser versions

* fix: chart toolbox icons gap chaos

* style: remove unused title in svgs

* fix: index loading not centered

* fix: get missing echarts loading back

* fix: date & time cannot be formatted to correct locale string (#813)

* chore: drop support of nodejs 12

* docs: update documentation

* feat: dark mode support

* chore: use redux to manage global state

* chore: update dependencies

* build: increase yarn network timeout to avoid build error in github action

* feat: dark mode support

* chore: add module preload