ListBox and related now handle up to sal_Int32 elements correctly.
sal_Int32 instead of sal_Size or size_t because of UNO and a11y API.
Also disentangled some of the mess of SvTreeList and other containers
regarding sal_uInt16, sal_uLong, long, size_t, ... type mixtures.

Change-Id: Idb6e0ae689dc5bc2cf980721972b57b0261e688a
Reviewed-on: https://gerrit.libreoffice.org/8460Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>