Architecture Refactor Suggestion: App-irrelevent Format Filters

[Thorsten Zachmann]

Hello,

> Note: this is a problem for some Karbon filters, since they used
> KarbonPart to access shapes for shape painting. We can modify
> KoDocument::paintContent(painter, rect) to do that instead.

it is not for painting but for creating the structure to read so it is not 
easily possible to change these filters as they depend on karbon and can't be 
used by e.g. flow.

Thorsten