* [react] Use HTMLDialogElement for the dialog node
* Actually add the `open` property
* This update requires typescript 2.6
* Update dependents of react to also require typescript 2.6
* react-virtualized: added missing properties to GridCellRangeProps
* react-virtualized: corrected type of overscanIndicesGetter in Grid.defaultProps
* react-virtualized: added name to "Definitions by" section
replaced single declaration file with multiple files to represent the module structure of react-virtualized.
This makes the future maintanance easier, because changes in the lib can be easier mirrored in the corresponding declaration file.
This typings update should be the last with large breaking changes