Add support for multiple requests at once on "Axes Data" function

[pedrofrancescon]

For now the Axes Data function has a dropdown where you can specify only one type of data to be requested at a time.

On the node-focas library this function translates to the cncRdAxisData function, which supports multiple "types" to be requested at once (as long as they belong to the same group/class and not more than 4 types are being requested simultaneously).

The function Axes Data should have the same behaviour. This not only could occasionally be more practical to use but also saves traffic resources when communicating with the CNC.