Extend the CShutterBase interface to offer setPower()/getPower()

[dscho]

It was not very clever by us to implement our own Laser interface. Not only did we re-invent our own, poor plugin architecture, we also made a poor design choice: the setPower()/getPower() accessors should be an integral part of the CShutterBase interface because the device adapters know better than anybody else how (or if) the laser power can be set.

So let's finally correct that mistake by working with the Micro-Manager team to extend the Micro-Manager API, for everybody's benefit.

This is most likely quite a bit of work because essentially all 93 of the files reported by git grep -w CShutterBase DeviceAdapters/ will need to be adjusted.

[dscho]

Note: I assigned @hkmoon but of course I will work closely with him to get this change into Micro-Manager proper.

[dscho]

Actually, a better idea might be to imitate the AutoLase plugin: https://github.com/openspim/micromanager/blob/ba909681829af0e2b9a7ac7c573d140b3b137458/plugins/autolase/src/ch/epfl/leb/autolase/LaseThread.java#L224-L243 and https://github.com/openspim/micromanager/blob/ba909681829af0e2b9a7ac7c573d140b3b137458/plugins/autolase/src/ch/epfl/leb/autolase/LaserConfig.java#L15-L16