Make it possible to fatpack to a copy of the original script

[robinsmidsrod]

When you use this piece of code (from the docs) in dist.ini the file mentioned in your build directory is overwritten with a fatpacked version. This is as intended

[FatPacker]
script = bin/myscript

It would be awesome if you could implement a new feature that allows the fatpacked file to not overwrite the source, but create itself with a configurable name. That would allow me to use the CopyFilesFromBuild dzil plugin to move it back into my source directory and distribute the non-fatpacked version to CPAN while retaining the fatpacked in my repo on GitHub.

Maybe one of these syntaxes are useful?

[FatPacker]
script = bin/myscript
dest = bin/myscript.packed

[FatPacker]
script = bin/myscript bin/myscript.packed