add mk_evar tactic (to replace Coq's strange evar tactic) and use it

See merge request iris/stdpp!289

Make `done` work on `is_Some`.

See merge request iris/stdpp!293

Fix priority of `Permutation_app'`.

Closes #114

See merge request iris/stdpp!291

add lookup_union_l

See merge request iris/stdpp!292

This is a workaround for https://github.com/coq/coq/issues/14571

This fixes #114.

Update changelog for filter extensionality lemmas

See merge request iris/stdpp!290

Make sum_inhabited_r not a copy of sum_inhabited_l

See merge request iris/stdpp!288

This existed at least as far back as
iris/stdpp@361308c7, 8 years ago.

rename insert_delete → insert_delete_insert; add new insert_delete matching delete_insert

See merge request iris/stdpp!287

Add a few set and map related lemmas

See merge request iris/stdpp!284

Fix potential stack overflow related to `Pretty N`.

See merge request iris/stdpp!286

add {fst,snd}_map_zip

See merge request iris/stdpp!285

Rewrite cross split lemmas so they can more easily be used for forward reasoning.

See merge request iris/stdpp!283

Various setoids lemmas for maps, lists, and option

See merge request iris/stdpp!281

Add lemmas `map_intersection_filter` and `map_difference_filter`.

See merge request iris/stdpp!282