Convert tests:
- test_meta_xtextattach_toxmark
- test_meta_xtextattach_refmark
- test_meta_xtextattach_textfield
- test_meta_xtextattach_footnote
- test_meta_xtextattach_meta
- do_meta_xtextattach
- test_metafield_xtextfield
- test_metafield_xpropertyset
- test_load_store
- test_load_store_xmlid

Change-Id: I471329e8088b533eedec6a55c521ed313f1960b4
Reviewed-on: https://gerrit.libreoffice.org/41863Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>