Add command to load state from another branch

[toadjaune]

Hi there !

Thanks for this extension, I've started using it a few days ago, and so far it works great !

I sometimes have several branches related to each other (happens for example when forking off your current work branch to experiment with something really uncertain without polluting your work branch), and I'd like to be able to go restore state associated with another existing branch.

I'm unfamiliar with the structure of this extension, but this seems like a relatively easy change to implement, I'm assuming adding a new command, which this time takes an argument, then triggers the existing restore process, would be enough ?

What do you think ?