- Added the `screen` parameter to `Chart`, allowing for monitor selection. This should be an index from 0 (0 = primary monitor, 1= second monitor, etc.)
- `vertical_span` method, allowing for vertical lines/spans to be drawn across the chart.
- `set_visible_range` method, which will set the visible range of the chart based on two given dates.
- `resize` method, which resizes the chart to the given size.
- `sync` will now sync both charts, regardless of which one is scrolled/zoomed.