Create some common optics mirrors classes and populate I05 optics with them

There are quite a few common focussing/collimating/switching mirrors in GDA code for many beamlines. As always there are subtle differences and all flavours of PV suffices and combinations of various epics records. I05 has 3 different mirrors and some of them can be found on other beamlines.

## Acceptance Criteria
* Specific criteria that will be used to judge if the issue is fixed
