Add support for NetworkTables arrays

[ThadHouse]

Array support has been added to the WPILib SmartDashboard class, so we should make sure we can use and display those arrays here. If we do not have that done by kickoff, we should remove those methods from WPILib in order to not confuse teams.

[AustinShalit]

Any ideas on how we should display arrays?

[SamCarlberg]

Take a look at how OutlineViewer does it. Just the UI; the source is a mess

[NoMod-Programming]

How about a listbox? It'd be relatively simple to implement and should work pretty well