Merge branch 'feature/8505_slicing' into feature/8528_slice_event
re #8528: TDD for processing time slices definition
re #8528: Extends Reducer to support slicings
re #8528: Methods to slice event workspaces
re #8528: Update SliceEvent to apply slicing
re #8528: Use the slices to compose the name of the output
re #8528: Export the slicing support to the ISISCommandInterface
Refs #8528. Allow reducing multi slices from event workspaces
Refs #8528. Avoid slicing the sample

By making the can workspaces histograms, in loading time, we ensure that
they will not be sliced in any time during reduction.
Refs #* develop.
Merge branch 'feature/8528_slice_event' into develop