Add Fields to OBDb

[blu3knight]

Is your feature request related to a problem? Please describe.
No problem, but OMDb Offers other data that would be great to bring in.

Describe the solution you'd like
Some fields available in the OMDb API for Movies that could help in creating some interesting searches.

Here are the fields:

• Actors
• Plot
• Rated

[mProjectsCode]

rating is already included, I added actors, but I won't add plot for now.

[sdavisNL]

Please add plot and writers.