David's latest versions from IMAT

[FreddieAkeroyd]

Description of work

Add David's IMAT files - see ISISComputingGroup/IBEX#1737

To test

Which ticket does this PR fix?

Acceptance criteria

Already working on IMAT

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Code Review

• Is the code of an acceptable quality?
• Are the PVs named according to the naming standards.
• Have suitable disable records been added?
• Have suitable simulation records been added?
• Have the finishing touches been applied?
• Is there an emulator for the device?
• Have the changes been documented in the release notes. If so, do they describe the changes appropriately?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed.
• Does the IOC respond correctly both in full and simulation mode, where it's possible to test both?
• If there are multiple _0n IOCs, do they run correctly?

Final steps

• Reviewer has updated the submodule in the main EPICS repo? See Reviewing work for the subModules of EPICS in the Git workflow page for details.
• Reviewer has moved the release notes entry for this ticket in the "Changes merged into master" section

[FreddieAkeroyd]

The code as is makes multiple copies of the common ioc startup file, this is incorrect but as it is already in use I will merge. The code should be tidied up - see ISISComputingGroup/IBEX#1738