Add the ability to download specific videos when providing their link

[DasherPack]

No description provided.

[Inrixia]

Added in 1dcded9, doesn't use URL's but the video id which is just the end bit of the url.

[Yannickclae]

This doesnt seem to work for me. It just tries to fetch new videos, and the videoID is removed from the settings.json file.

[Inrixia]

@Yannickclae can you give me a link to the video you are trying and copy the entire list/array/property your adding its guid to in your settings file?