ViewDocument3 method takes OpenType parameter, which allows to decide
if user can choose opening the document read-only or to edit.

Since we need to show localizable strings, we need to bootstrap part
of LO (l10n), which is impossible when e.g. 64-bit ActiveX DLL tries
to load installed 32-bit sal DLLs. Thus, we need a separate helper
.exe, which architecture matches the rest of installed LO, and which
handles user interaction.

Change-Id: I0ad53ba64272fb84728d2221e3dc85d3eefdda68
Reviewed-on: https://gerrit.libreoffice.org/72355Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>