Resolve "Notion de step/sous-step à définir"

Closes #10 (closed)

changed milestone to %v1.6.6.0

assigned to @stephane.dervaux

added 1 commit

• 7540decb - remove substep menu for step with father

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added 3 commits

• bad16c4c - block adding substep in substep
• 1d36abf8 - remove add composition on box step
• 3c550780 - new context menu for remove step from his father

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marked this merge request as ready

merged

mentioned in commit b3e4757c