StripPortions: Move tooling closer to EditEngine/Outliner IIHEADmaster

Moved central stuff needed for decompose to Primitives
closer to EditEngine/Outliner. There is now a
StripPortionsHelper as abstract base class with two virtual
methods replacing the lambdas used before. That is easily
implementable to all needs. Adapted all usages. Also the
methods for creating needed Primitives from DrawPortionInfo
or DrawBulletInfo is now local/private in EditEngine.

This step should still change nothing in functionality, but
is more preparation to be able to directly create Primitives
from Outliner/EditEngine setups for paint and (re)use.

Change-Id: Ie2bcebf4030128f88be229d789944cc2842eafb6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/187045
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

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