This patch is not completed. It adds a dropdown field to toolbar.
When you click it, the page preview focuses third page (hard coded).
This patch's purpose is getting information from developers how to
add numbers to dropdown field.
--
v2: Removed unnecessary MV_SPECIFIC_PAGE case.
v3: Added dropdown field and defined new controller for new field.
v4: Implemented page focus who user want.
v5: Used NumericField instead of Combobox and added page count control
v6: Used nSlotId instead of SID_JUMP_TO_SPECIFIC_PAGE in order to fix macOs build error.

Change-Id: I722fbffcc72a1bcee70065e2e9369b73ab27f100
Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/19335Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Oliver Specht <oliver.specht@cib.de>