Build configurations

[marchbold]

Add the ability to specify different project build configurations to allow different values to be used by the generate commands (eg inserted into the application descriptor).

Currently we have:

"configuration": {
    "packageParam": "12345678"
}

It could be turned into something like:

"configuration": {
    "packageParam": "12345678"
},
"buildTypes": {
    "debug": {
        "configuration": {
            "packageParam": "AAAAABBBBB"
        },
    },
    "release": {
    }
}

We will need a way to specify the configuration to use when building and the values in there would then override the default configuration values.