Add UNO API property tester for read-only properties 'double', 'long',
'short' and 'string'.

Change-Id: I7177e133972058b0272a3cf8493521fbfbcade32
Reviewed-on: https://gerrit.libreoffice.org/52142Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jens Carl <j.carl43@gmx.de>