Reduce the number of JAI ImageIO registrations

Fixes ticket #11034.
Make 'registerServiceProviders' static

Suggested by @joshmoore and @rleigh-dundee.
CellWorx: populate StartTime/EndTime on PlateAcquisition

These values are just taken from the AcquisitionDate on the first and
lates Images.
Merge pull request #608 from melissalinkert/rebased/dev_4_4/imageio-registration

Reduce the number of JAI ImageIO registrations (rebased onto dev_4_4)
Merge pull request #611 from melissalinkert/plateacq-starttime

CellWorx: populate StartTime/EndTime on PlateAcquisition