Rename Slice5D to Interval5D and disallow undefined (slice(None)) axes#12

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Tomaz-Vieira wants to merge 6 commits intoilastik:mainfrom

Tomaz-Vieira:interval5d

Commits on Dec 8, 2020

[WIP] Creates Interval classes. No mo\re floats. Allows None
Tomaz-Vieira
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Commits on Dec 10, 2020

Commits on Dec 11, 2020

Commits on Feb 5, 2021

Renames parameters from slc to interval
Tomaz-Vieira
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