Add Resolume Arena 5 / 6 Plugin

[dimitre]

There is a fixture editor: https://www.resolume.com/support/en/fixture-editor

• Link to the software / desk console website:
  http://www.resolume.com/
• Where can fixtures of this format be downloaded?
  http://dmtr.org/resolumefixtures/ (link doesn't work anymore)
• What file type is the fixture format?
  XML
• Does a schema / description / documentation of the format exist?
  Unknown
• Are there many fixtures of good quality in this format?
  Unknown
• Is there any existing work done to parse this format?
  Unknown