1. \rtlch, \ltrch should be placed before their properties.
2. Do not mix associated and normal character properties in output.
3. Do not output empty "\rtlch \ltrch", "\ltrch \rtlch" pairs.
4. Handle associated character properties runs instead of
handling separately their parts without order of them.

Change-Id: Ibbf7365d04708682a5f1eb664a579c60a47465d2
Reviewed-on: https://gerrit.libreoffice.org/72578
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>