Add godot3 and godot3-mono, remove godot4{-mono} as it's now in extras

[Calinou]

Manifests were copied from the extras bucket from the commit before they were updated to Godot 4.

godot and godot-mono can be installed from the extras bucket if you need Godot 4.

• This closes [Request]: Add godot3 and godot3-mono #1060.

• I have read the Contributing Guide.

[idbrii]

I would suggest keeping godot4 and godot4-mono.

The Versions bucket has python312 even though python 3.12 can be installed from the Main bucket. Similarly, people can install extras' godot to stay on latest or use godot3/godot4 from Versions to stick on a specific major version.

It also prevents failed upgrades if someone had installed godot4 and then tries to upgrade it to the latest 4.x release.

However, godot4 is still pointing at rc6, so fewer manifests to maintain is a good reason to remove it.

[idbrii]

I gave this a spin and (after updating hash and version to 3.5.3) installed godot3-mono.

However, checkver is incorrect. https://github.com/godotengine/godot/releases/latest will only show one release and it'll probably be a 4.x one.

I think instead it needs to point at the full release list and hard code 3 in the version.

I think this should work:

    "checkver": {
        "url": "https://api.github.com/repos/godotengine/godot/releases",
        "jsonpath": "$[*].tag_name",
        "regex": "(3.[\\d.]+)-stable"
    },

I used jsonpath expression tester to test the query and regex101 to test the regex on those results (but without escaping \). It matched 3.5.3.

Failing that, this will probably scrape the html correctly:

    "checkver": {
        "url": "https://github.com/godotengine/godot/releases",
        "regex": "(3.[\\d.]+)-stable"
    },

Alternatively, it could point at the 3.x download page: https://godotengine.org/download/3.x/windows/