model.Component: support for twoWay bindings

A one way binding looks like this:

bind: {
    startTime: value: data => data.startTime
}

It should be optionally possible to not only update component configs when view model data props change, but also support the other direction. Change a component configs => update the bound model data property.

bind: {
    startTime: {twoWay: true, value: data => data.startTime}
}

To do this, model.Component needs to check if a config object was passed. If so, use value.value.

Neo.mjs: set() needs an update, to also call this.afterSetConfig() in case the fn does exist.

This method needs to get implemented on component.Base (lowest VM entry point).

afterSetConfig(key, value, oldValue) {
    if (Neo.currentWorker.isUsingViewModels) {
        let me   = this,
            bind = me.bind;

        if (bind && bind[key] && bind[key].twoWay) {
            me.getModel().setData(key, value);
        }
    }
}