Adding NSHumanReadableCopyright to plist

[unindented]

It'd be good to be able to add NSHumanReadableCopyright:

    <key>NSHumanReadableCopyright</key>
    <string>Created by Daniel Perez Alvarez 
Copyright © 2015 FooBar Inc. All rights reserved.
</string>

It'd allow us to give some more info in the About dialog:

And in the Quick Look preview:

I'd implement this myself, but I don't know how we'd pass the info... The project uses version-string for Windows specific stuff, but maybe we'd benefit from generic-named attributes that can apply to multiple platforms.

What do you guys think?

[hankbao]

👍

[erkyrath]

See #253

[malept]

Actually, see #223.