add an IDocumentController::DocumentActivation flag to control adding

documents to the "Files/Open Recent" menu and use it in the patchreview
plugin to prevent pollution of said menu.
DocumentController::activateDocument() no longer adds the target document
to the Open Recent menu; use DocumentController::openDocument() for that.
Additionally, the patch review plugin now handles the hardwired maximum
number of files to open (15) correctly, instead of opening no files when
that maximum is exceeded.

REVIEW: 129231
BUG: 371210