[Feature Request] Merge Libraries

I would like the ability to merge library views into 1 single library. 

For an example I have Docu-Shows and Documentarys. I want the ability to select both libraries and select merge. 

This would be especially helpful for those of us wanting videos and photo's, or videos and tv shows... or even videos and home videos or what ever crazy combination you can come up with. I also believe it would be much easier to implement than having a scanner to do both movies and Tv shows, whilst still giving the same end result. 

What do people think? 

I might do some mock ups for it, seen as the collection ones really helped show what would be possible... 

Early 2021 clean-up: duplicate