Only process relevant parts inside an OOXML archive when replacing tokens

[jensschuppe]

Currently, the LocalUnoconv renderer processes all files found inside the ZipArchive, including metadata files, while only the document itself and parts containing user text (such as footnotes, footers, etc, see OOXML anatomy) should be necessary to be processed. Ignoring all other parts would increase performance of the rendering process.

[jensschuppe]

cc46f77 filters for XML assets only, as a first step, since binary assets (e.g. images) have shown to become damaged when run through token replacement. This should also reduce conversion time for files with many or large media assets.

[jensschuppe]

This should be either further improved by filtering for really relevant XML files only or be removed in favor of PHPWord template processing. Currently, regexp replacement is only done when the Use PHPWord macros for Live Snippet tokens option is off.