Adds new dark color scheme to toolbar layout.
Features
- Added new dark color scheme to toolbar layout.
- Added 'dragNodeElement' argument parameter to 'onDrop' event listener.
- Added new 'enablePan' functionality.
- TypeScript improvements.
- Added new 'OrgChart.editUI.renderHeaderContent' method.
- Added 'miniMap.draggable' to TypeScript.
- Added new 'OrgChart.miniMap.draggable = false' functionality.
- Added two new private methods:' _changeCursorOnPanStart' and '_changeCursorOnPanEnd'.