Support for AG-UC2 piezo controller

[ddkohler]

@ksunden

https://www.newport.com/medias/sys_master/images/images/he3/he9/9135085486110/Agilis-Piezo-Motor-Driven-Components.pdf

On the whole, the interface is of the same structure as the existing code, but behavior is different, there may be ways to share some code:

• Devices do not necessarily have limit switches (ours do not)
• Move Absolute is therefore either not available or misbehaves > (Even when it is supported, these devices move all the way to one switch, then the other, then back to the first, then to the position requested)
• Requires explicit setting between manual (controller) mode and remote (Computer) mode

In all, we have code that (largely) works for som of the rotary mounts we have, but not all, planning on leaving this until at least the rotary mounts that we have code for are in use.