This PR changes several details on the histogram / time series
Some colours have been changed all around (bars, scrubber)
The clear button has been changed to a subtler alternative. This has been changed on the category widget as well. It adds a new property
The play button has been aligned to the bottom.
The Header / Description for the time series is aligned completely to the left. This has been done in a relatively hacky way. We should consider a big refactor of how widgets are composed.
BREAKING CHANGE: there's no selectedColor anymore, but unselectedColor. This is because now we only keep the original color for the selected buckets.
There's no specific issue for this.
This PR changes several details on the histogram / time series