WIP: Add DSSC device

added 2 commits

changed target branch from master to devel

added 10 commits

048d7312 - 1 commit from branch devel
d70a481b - Adding new correction device snapshot
53cca8ca - Hotfixes applied during beamtime at SQS
bc476c48 - Renaming to DsscCorrection
4f18e1bb - Adding rudimentary testing of kernels
8a43aaa8 - Directly import Karabo symbols
f2fc2e03 - Tuple syntax for schema definition
36b204df - Update descriptions
309df7f8 - Removing fields required by old manager
39f2ee37 - Merge branch 'add-dssc-device' of ssh://git.xfel.eu:10022/karaboDevices/calng into add-dssc-device

merged

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