Prioritize file name extensions and filenames in task queue

[opensemanticsearch]

Like the yet implemented user interface for prioritization of certain files in ETL task queue which are yet not extracted and planed prioritization of whole file directories and subdirectories we want to prioritize by file name extensions and file names, too.

[Mandalka]

Some first config proposals for prioritization of file name extensions and file names in future config file https://github.com/opensemanticsearch/open-semantic-etl/blob/master/etc/opensemanticsearch/task_priorities

Feel free to contribute (discussion / proposals / extend by pull request)!