InCell: correct for Z/T recording oddities in InCell 6000

Fixes #12416.
InCell: prevent NPE if the imaging mode is not specified
Merge remote-tracking branch 'origin/dev_5_0' into rebased/dev_5_0/12416
Zeiss LSM: fix offset calculationg for > 4GB files with SizeT > 1

See https://www.openmicroscopy.org/community/viewtopic.php?f=13&t=7560
Merge pull request #1221 from melissalinkert/rebased/dev_5_0/large-lsm-offsets

Zeiss LSM: fix offset calculation for > 4GB files with SizeT > 1 (rebased onto dev_5_0)
Merge pull request #1216 from melissalinkert/rebased/dev_5_0/12416

Fix Z and T size calculation for InCell 6000 data (rebased onto dev_5_0)
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