Edit existing components

[jdryg]

Instead of inspecting, editing, recomponentizing and manually replacing an existing component, the player should be able to edit components in-place.

There's a problem with the I/O pins and the wires already attached to those, if the user decides to remove some of them. I cannot use the name of the pin to distinguish it between the 2 component versions (before and after the edit), because the only edit a user might want to do is to rename the component.

Scripted gates support editing and the wires stay in place if the width of the i-th pin didn't change. Should probably do the same here.