Allow nesting more than one time in lang json files

[JanBrin]

Allow nesting strings multiple times and access them e.g. via linguini.get("intro.newColors.coolColor", "en", TypeMappers.String);

{
    "data": {
        // This is a language category:
        "intro": {
            // This is a language item:
            "myFavoriteColor": "My favorite color is blue.",
            "newColors": {
              "coolColor": "This is my cool color"
            }
        }
    },
    "refs": {}
}

[Pax-0]

honestly, this would allow for better organization of translated lines, this package is too useful as is, it will only make it better :)

[Kaisarion]

working on it.
current form of linguini looks to encourage messiness within json, which left our file 5000+ lines with this lack of customization.
have forked & will post finished product here if you still want to use it.