Add TargetRefiner interface + minor refactor
Add / rename testing data

Move calibration field images to data/calibFields folder
Add static circle target images
Add real calibration data test
Add precise circle test
Add position precision test on static targets
Add CorrelRefiner interface
Add failing preciseCircleTest
PreciseCircle test passed
Add static target test for CorrelRefiner
Pass staticTarget test via finding maximum continous correlation