name individual values on metamodule controllers

[AutumnCheney]

if you look at the possible values of some controllers on certain modules, you'll see that along with an internal numeric value, each number has a string (label) associated with it too. for example, on the analog generator's "waveform" controller, each waveform value has a number but also a label that tells you what it is, like a saw for (1) and pulse for (2)

i would love to see this on the metamodule. it would make certain custom controllers using the multictl module much easier to learn and use. this shouldn't require changing the way the metamodule sends values in the code, since this would only be for aesthetics.