Add support for custom localization schemes

[randytarampi]

Ideally we take some input definition (a schema) of what our localization objects look like so we don't have to massage localization files into strict, flat, key value string pair.

It'll allow us to support some structure like this:

{
    "Some simple key": "Some localizable value",
    "Some complex key": [{
        "value": "Some localizable value"
    }, {
        "value": "Some localizable value",
        "Some contextual descriptor": "Some contextual information"
    }, {
        "value": "Some localizable value",
        "Some contextual descriptor": "Some contextual information",
        "Some other contextual descriptor": "Some other contextual information"
    }]
}

And turn it into this:

{
    "Some simple key": "ʕつ•S•ʔつ",
    "Some complex key": [{
        "value": "ʕつ•S•ʔつ"
    }, {
        "value": "ʕつ•S•ʔつ",
        "Some contextual descriptor": "Some contextual information"
    }, {
        "value": "ʕつ•S•ʔつ",
        "Some contextual descriptor": "Some contextual information",
        "Some other contextual descriptor": "Some other contextual information"
    }]]
}