Load the list of activated filters and execute them in order

Load the list of activated filters and execute them in order

Implementation: This requires refactoring the internal structure of the office import as currently just a boolean parameter is used for the HTML filtering. In particular, the JODConverter filter chain is configured also just once. The internal structure needs to be refactored to build the filter chain once for every import (this should be possible without significant overhead as the office process is managed in a different object). Further, we need to add the possibility to transform the XDOM result.