#978 Sysfilter AI export XML filter

[Jean-Christophe Helary]

As a follow up to [#928] and similar to the Infix filter, create a filter for Sysfilter AI export XML format.

The structure is:

<?xml version="1.0" encoding="utf-8" ?>
<syscatXML>
    <AICS2File>
        <Application>Sysfilter for Illustrator CS2-CC Version: 4.0.1 Build: 1</Application>
        <RemApplicationN>Adobe Illustrator</RemApplicationN>
        <RemApplicationV>15.1.0</RemApplicationV>
        <Filename>AI_source_file_name</Filename>
        <Exporttyp>xml</Exporttyp>
        <numTF>number_of_text_frames</numTF>
        <onlylayer />
        <Textframe TfId="1362">
            <layer>layer_name_and_type (for reference only ?)</layer>
            <text>
                <p>text_box_contents (translatable)</p>
            </text>
        </Textframe>
    </AICS2File>
</syscatXML>

I have a sample, feel free to contact me if you want to handle this RFE.