Scan with a wire scanner device

[kabanaty]

Is your feature request related to a problem? Please describe.
A method to make the wire scanners move. The functionality to abort scans should also be implemented. The wire scan process involves more than just moving the device:

1. Configure wire scan parameters using other methods (outlined in other issues)
2. Reserve and configure BSA/EDEF, if not already done
3. Initialize wire scanner device (handled by :STARTSCAN PV routine)
4. Move wire scanner device (handled by :STARTSCAN PV routine)
5. Confirm wire scanner device retracted upon completion of scan

Describe the solution you'd like
wire.startScan() and wire.abortScan() methods. Should be straightforward in that Ziyu Huang has handled most of the details in the PV :STARTSCAN (ex. WIRE:HTR:340:STARTSCAN). epics.caput(":STARTSCAN, 1) should be sufficient for steps 3-5.

[kabanaty]

Method to start a scan introduced in #176. Still need a solution for aborting scans.

[nneveu]

Does this issue stay open? Or was the abort added to #176?