Use trait From instead of Into in actor macro.

[BratSinot]

No description provided.

[elenaf9]

Isn't this a duplication of #162?
But it seems like this repo in general is not actively maintained anymore.
@leenozara @hardliner66 do you know anything?

[hardliner66]

It basically does the same thing, except that it renames the function intos into froms. Additionally #162 introduces a few tests.

The repo is inactive and @leenozara doesn't respond to messages. He's also the only one with write access to the repository, so I don't think the repo will get active again until he returns and/or gives someone else write access.