replaced use of PTR_CAST, IS_TYPE, ISA in
avmedia, basctl, basic, cui, dbaccess, vcl,xmloff

Change-Id: If4496762e82e896b6fbc362e6626502703c245f5
Reviewed-on: https://gerrit.libreoffice.org/18905Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Oliver Specht <oliver.specht@cib.de>