* Make routes in ModuleConfig required
* Make Panel options nullable
* Clean up InterfaceConfig and LayoutConfig types
* Remove DisplayHandlerFunction and rename handler to component
* Use template interpolation when registering extensions
* Add support for scaffolding typescript extensions to extensions-sdk
* Add support for building typescript extensions to extensions-sdk
* Fix type issues in extension templates
* Expose types of extensions-sdk
* Add language option to create-directus-extension