Replace BOOST_PP macros in comphelper with variadic templates. The
client interface should not change. However, there are a few side
effects due to this change. The most important being 1) There is no
longer a maximum number of service declarations limmited by default
at 12 for unwrapArgs and component_getFactoryHelper. 2)
component_getFactoryHelper now terminates early as soon as pRet is not a
null pointer.

Change-Id: I016fd208d0e80f91d8669fff29d58b6189e946d3
Reviewed-on: https://gerrit.libreoffice.org/18891Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>