Add support for multiple loop types

[alfredsgenkins]

Hey!

Giphy capture offers a feature to select a loop type of the video once it is recorded. I think Kap would benefit from having a similar functionality.

I suggest, instead of making a permanent setting like we have now (to loop the videos or not), have a dropdown next to FPS selection at the bottom. It could look similar to Giphy:

I suggest the following options:

• None
• Jump to start
• Reverse to start
• Fade black to start
• Fade white to start

What do you think? Where would you start implementing (I might contribute if we agree that is a useful feature).

[alfredsgenkins]

Maybe, we can also consider a feature that would allow moving the video starting position, if the video is looped. This could help to basically "select thumbnail" for non-autoplayed videos.