Use new block-based sheet api when available
Selection takes account of flipped state, add centre spot to reticle
Add comment
Remove unsupported compiler flags from Sparkle configs
Remove unintended code where flush count was always 1
Remove old code and docs
Update astrometry-test project with new files
Push mount interface declaration into CASMount
Remove unsupported commands, plate solve view now just knows about the mount base class
Add circular progress view test project
Add latest iOptron command spec
Update to new CASMount interface