CMS-1655 Content Manager: Replace DeleteContentWindow with a new DeleteContentDialog

Implement DeleteContentDialog that extends DeleteDialog and replace DeleteContentWindow with it.
CMS-1699 Add type definitions for space_delete in RemoteService.ts

Add strict typing for the parameter and result values of RemoteServiceInterface.space_delete()

* Check the RpcHandler method in Java to find the exact values accepted and returned.
* Use optional types (optParam?: string) where appropriate.
* Avoid use of any as much as possible and use concrete types.
* Look at types of space_list() and space_get() for reference.
CMS-1720 Old Content Manager: Path to parent content not displayed when creating new content
Merge pull request #246 from enonic/CMS-1720

CMS-1720 Old Content Manager: Path to parent content not displayed when ...
Merge pull request #241 from enonic/CMS-1699

CMS-1699 Add type definitions for space_delete in RemoteService.ts
Merge branch 'master' of github.com:enonic/wem-ce into CMS-1655

Conflicts:
	modules/wem-webapp/src/main/webapp/admin2/api/js/api.d.ts
	modules/wem-webapp/src/main/webapp/admin2/api/js/api.js
	modules/wem-webapp/src/main/webapp/admin2/api/js/api.js.map
	modules/wem-webapp/src/main/webapp/admin2/apps/content-manager/js/all.js
	modules/wem-webapp/src/main/webapp/admin2/apps/content-manager/js/all.js.map
Merge pull request #237 from enonic/CMS-1655

CMS-1655 Content Manager: Replace DeleteContentWindow with a new DeleteC...
Merge branch 'master' of github.com:enonic/wem-ce into CMS-1703

Conflicts:
	modules/wem-webapp/src/main/webapp/admin2/api/js/api.d.ts
	modules/wem-webapp/src/main/webapp/admin2/api/js/api.js.map
	modules/wem-webapp/src/main/webapp/admin2/api/js/lib/RemoteService.ts