Add multiple file selection when leeching from rclone.

[LuisAlfonsoB]

Currently it allows either full folder or single file.

https://rclone.org/filtering/#files-from-read-list-of-source-file-names

I think a way to implement it would be something like this:
-Select files you want in telegram
-bot creates a list.txt file containing the path of each file you selected
-add flag --files-from list.txt to the leeching script.

In fact I think this would work with folders/single file as well so it could be the default way of doing things.