Add individual position indicators

[ThomasLohnert]

Added records indicating whether the motor is stopped at one of the first 3 motion setpoint positions (for "Motion Setponts Few" OPI).

Related PR: ISISComputingGroup/ibex_gui#812

Issue: ISISComputingGroup/IBEX#3577

[FreddieAkeroyd]

This has some code duplication and is also not generic. Can we make it generic i.e. create the INPOS* automatically based on number of positions? We should make the INPOS logic a db template, then if we can't get then created automatically we could have the IOC either use a substitutions file or do dbLoadRecordsLoop()

[ThomasLohnert]

Template substitution is a bit awkward for macros with other macros as default values, so I went with dbLoadRecordsLoop(). Not passing in the number of setpoints as from the looks of it we don't know these before runtime, and otherwise it would require pulling this out from the number of lines in the lookup file or something like that, which seems a lot of effort for little gain.

Note this means that the motionSetPoints.cmd in the config directory now has to explicitly load the extra .db file for the changed OPI to work properly, which needs to be upgraded on the instruments. I have added an upgrade script for this here: ISISComputingGroup/EPICS-upgrade#19