GitLab

- More robust parsing of value objects from lines
- Added import of editor relations
- Added reftype "Book" to import
- Re-organized code
- Annotated fields with commons

Aggregated Titling:
- "T4" is now ALWAYS appended to "Title of Article" or "Book Title" if present.
  This is due to conform with our Citavi 5 test file.

Webclient Extension (#5):
- Adds webclient extension with "Import RIS" file topic command
- Registers dmx-upload-dialog extension for handling .ris file uploads

New Service (#6):
- Processes .ris file uploads
- Endpoint for creating "Journal Articles" from .ris file contents
  Tested importer with a Citavi 5 RIS export file and a Scopus search result .RIS export file

To test drive:
- Make sure to have the dmx-upload-dialog plugins installed
- Make sure to run DMX 5.1 or later
- Make sure to confgure a dmx-filerepo path before trying to upload .ris files
- Make sure to be logged in to see the "Upload" icon in the task bar
- Use the "Import RIS" command on file topics ending on (.ris)
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