cool#9992 lok doc sign: async read-write DigitalSignaturesDialog

This finally allows removing the hack for the LOK case in
SfxObjectShell::CheckIsReadonly() to show the signatures dialog
read-only.

Also fix a case while signing PDFs where the file stream was on the
stack, but now that we finish signing in an async callback, signing
crashed due to a use-after-free.

Fix that by giving the std::unique_ptr to the utl::OStreamWrapper ctor,
which knows to take over ownership in this case, and that wrapper is
reference-counted.

Next problem is that the add/remove buttons in the dialog are still
hidden in the LOK case, that's not yet fixed here.

(cherry picked from commit 482c7c585160681b263c6245a745c21df70e7507)

Change-Id: I71ee50ae55d4e62f5d265a35e3810e3b2b63a9b9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173244
Tested-by: Caolán McNamara <caolan.mcnamara@collabora.com>
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>

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