[Merged by Bors] - fix(library/init/data/int/order): remove double namespaces, protect nat and int lemmas #245
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This PR protects the lemmas listed in leanprover-community/mathlib3@85ce04a since they are superseded in mathlib. They were all added in #229.
Also, this PR removes:
int.mul_sub_left_distrib
in favor of the shorterint.mul_sub
,int.mul_sub_right_distrib
in favor of the shorterint.sub_mul
.Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/preparing.20for.20lean-3.2E13.2E0/near/197817609