add insert_map_seq_0

See merge request iris/stdpp!314

add lookup_take_Some

See merge request iris/stdpp!313

add binder_list

See merge request iris/stdpp!312

Mark gset methods as simpl never to stop `cbn` from unfolding them

See merge request iris/stdpp!298

Add more lemmas for FinMaps (for union, filter, difference)

See merge request iris/stdpp!245

Generalize `map_filter_insert` so that it covers both the True and False case.

See merge request iris/stdpp!310

Use `_True` and `_False` for the specific cases.

Weaken premise of `map_filter_delete_not` and make it consistent with `map_filter_insert_not'`.

Clean up `empty{',_inv,_iff}` lemmas.

See merge request iris/stdpp!307

Write them all using `` and consistently use the `_iff` suffix.

some lemmas about list submseteq

See merge request iris/stdpp!305

Add lemma `map_singleton_subseteq_l` and `map_singleton_subseteq`.

See merge request iris/stdpp!308