ITC

[Tom-Willemsen]

Part of #2593

Splitting this off as a separate ticket so that it can be reviewed independently of my work on the IPS

[Tom-Willemsen]

• Add ITC OPI ibex_gui#690
• Add Yes/no so that record is testable EPICS-ReadASCII#7
• Ticket4831 cryosms simple start EPICS-DeviceEmulator#58
• Ticket2593 add ioc itc503 EPICS-Itc503#1
• Ticket2593 add ioc itc503 EPICS-ioc#273
• Ticket2593 add ioc itc503 EPICS-IOC_Test_Framework#90
• https://github.com/ISISComputingGroup/EPICS/pull/120

[AdrianPotter]

Some minor rework on OPI and IOC