*8778* Dataverse plugin: fix RT template handling

Remove preg_replace() calls & greedy match patterns, not really necessary
*8778* Dataverse plugin: fix RT template handling

Replace modified RT metadata template with output filter. Output filter adds data citation and removes local download links for suppfiles deposited in Dataverse.
*8778* Dataverse plugin: fix RT template handling

Replace modified RT supp files template with output filter. If suppfile is in Dataverse, filter replaces local view/download links with link to dataset in Dataverse.
*8778* Dataverse plugin: fix RT template handling

Replace modified RT supp file metadata template with output filter. Replaces local suppfile download link in RT suppfile metadata page with link to dataset, if suppfile deposited in Dataverse.