Tweak default control type

[Fire-wood]

Whenever the name of a control is tweaked, its form will always return to the default knob regardless of what it was previously (slider, button, etc). Having a control that remembers its form and only changes when set by the user would be good.

[cpdt]

So, in order to "bind" controls in the code to those on a node surface, we identify them by their name and type (num, midi, graph, etc). That means if you change the name of a control in the code, it effectively removes the old control and creates a new one - that's why the display mode resets, and connections are removed.

A way around this would be to, instead of creating a new control, find one which isn't bound to anything and "steal" and rename it, instead of deleting it. This wouldn't be perfect, but probably a lot closer to expected behavior.