[multi-part] Make context menu match spec.

* Update context menu items in DirectoryFragment as defined in PRD
* Fix selection by right click in pickers
* Fix several bugs caused by selection in pickers

Functionalities are not done. OpenWith and OpenInNewWindow is not
yet supported.

Bug: 31495650
Bug: 31345822
Change-Id: I7be3169e2ee69971c0e86aa8b5e1078b15eb2960