Delete MemoQ QA-tags on import of memoq xliff

The memoq xliff contains mrk-tags, that stand for certain QA marks, that are comparable to translate5s MQM tags.

In the long run it makes sense to map the memoq QA mkr-tags to translate5s MQM tags.

For now the goal is to simply delete the mrk tags during the import. According to the customer after the reimport to MemoQ they are still present anyway. Probably Memoq stores the information about the mrk-tags also elsewhere.

The tags to delete look like in the following segment. A test file comes via mail.

<source xml:space="preserve" mq:segpart="28"><mrk mtype="x-mq-range" mq:type="start" mq:ownerid="e72a1eb1-026a-4f46-9a9c-ab13b8ba2f37" /><bpt id="1" ctype="bold">{}</bpt><bpt id="2" ctype="underlined">{}</bpt>Inhalt<ept id="1">{}</ept><ept id="2">{}</ept><mrk mtype="x-mq-range" mq:type="end" mq:ownerid="e72a1eb1-026a-4f46-9a9c-ab13b8ba2f37" /></source>
<target xml:space="preserve"><mrk mtype="x-mq-range" mq:type="start" mq:ownerid="e72a1eb1-026a-4f46-9a9c-ab13b8ba2f37" /><bpt id="1" ctype="bold">{}</bpt><bpt id="2" ctype="underlined">{}</bpt>Conten<mrk mtype="x-mq-range" mq:type="end" mq:ownerid="e72a1eb1-026a-4f46-9a9c-ab13b8ba2f37" />ts<ept id="1">{}</ept><ept id="2">{}</ept></target>