Include license and shortcuts in autoupdate in schema.json

[se35710]

Fixes #2454

[r15ch13]

Nice!
But this will not work for shortcuts at the moment.
It requires adding update_manifest_prop "shortcuts" $json $substitutions to autoupdate() and fixing an issues with substitute().
Running substitute() over an multi-array will flatten it out.

"shortcuts": [
    [
        "godot-$version.exe",
        "Godot"
    ]
]

will become

"shortcuts": [
    "godot-3.0.6.exe",
    "Godot"
]

instead of

"shortcuts": [
    [
        "godot-3.0.6.exe",
        "Godot"
    ]
]

Fixing this will also allow us to run update_manifest_prop() on the bin property!
This could reduce the amount of rename post_install scripts.

[se35710]

@r15ch13 I can have a look at it. Should I continue to push into this branch and PR or create a new one?

[rashil2000]

Merged in #4528