Related: #i78498# improvements/corrections regarding outline level & Co

- import outline level attribute at Paragraph Styles
- import outline level attribute at paragraphs
- refactor code to apply list level properties to Outline Style
-- only consider WW8 list styles applied to WW8 Built-in Heading Styles
-- only assign our counterparts of WW8 Built-in Heading Styles to Outline Style

(cherry picked from commit 9032e17b9989d4fc8faefe7717d2ea14d124e653)
(cherry picked from commit c3a35e3885334cb37b2b569daaf536a8cc26031d)

Conflicts:
	sw/source/filter/rtf/swparrtf.cxx
	sw/source/filter/ww8/ww8par.cxx
	sw/source/filter/ww8/ww8par.hxx
	sw/source/filter/ww8/ww8par2.cxx
	sw/source/filter/ww8/ww8par2.hxx
	sw/source/filter/ww8/ww8par3.cxx
	sw/source/filter/ww8/ww8par5.cxx
	sw/source/filter/ww8/ww8par6.cxx
	sw/source/filter/xml/swxml.cxx

Change-Id: Ia70920f91300fa47236533f59356abb546a94fb3
Called C++ object pointer is null

Change-Id: Ia0bf5991a5beb363fde5e22a17920fc21fc0eca8
Called C++ object pointer is null

Change-Id: I88efc4be6ff869ef97a2b398d43f7b7914debfc6