Dash-leaflet

Changed

- Fixed a [bug](https://github.com/thedirtyfew/dash-leaflet/issues/56) typically seen with multiple maps in multiple tabs.

Added

- Added [MeasureControl](https://github.com/thedirtyfew/dash-leaflet/pull/50).

Added

- Added EasyButton component.
- Added tracking of map bounds.

Added

- The LayersControl has (finally) been added.

Changed

- Minor changes to GeoJSON standard functions adding support for discrete/continuous color scales for both scatter and choropleth

Added

- The map now supports [different CRS](https://github.com/thedirtyfew/dash-leaflet/issues/31).
- The GeoJSON component now [supports custom panes](https://github.com/thedirtyfew/dash-leaflet/issues/38).
- The GeoJSON now supports [changing style dynamically](https://github.com/thedirtyfew/dash-leaflet/issues/42).

Changed

- The MarkerClusterGroup is again included for backwards compatibility
- Per default, the GeoJSON now renders tooltip/popup if a `tooltip`/`popup` property is available on the feature
- The GeoJSON example functions (scatter, choropleth) have been moved from Python to JavaScript thus eliminating the dash-transcrypt dependency