Added support for local trakt list

[jaqb]

To be used as follows:

"Trakt lists": [
    "local: /config/mytraktlist.json"
]

[dreulavelle]

I didn't know you could do local lists. Can you show an example of the file? Like a screenshot.

[jaqb]

You just save output of API call to a file. https://trakt.docs.apiary.io/#reference/users/watchlist/get-watchlist