Add missing `iSplit` hint for `∗-∗`

See merge request iris/iris!331

This reverts commit bc8e2d15.
We already ignore those in the tex folders. We don't want global ignores for them.

Set `Hint Mode` for `inG`.

See merge request iris/iris!330

Lang lemmas

See merge request iris/iris!324

There is no need to include the `(∃ P', □ ▷ (P ↔️ P')  ...` since we
get closure under `▷ □ ↔️` from regular invariants.

Added a stronger version of cinv_open_strong

See merge request iris/iris!326

Simplify definition of invariant model.

See merge request iris/iris!327

Due to the new semantic invariants (!319) we no longer need to
close the model (i.e. `inv_def`) to be contractive, the semantic
invariant definition (i.e. `inv`) is already contractive.

Update gitignore for compatibility with Coq master

See merge request iris/iris!325

See https://github.com/coq/coq/pull/10947 (.coqdeps.d now uses the name
of the Coq Makefile) and https://github.com/coq/coq/pull/8642 (Coq now
generates empty interface files *.vos when compiling).

move docs around

See merge request iris/iris!323

make gFunctors_lookup a local coercion to avoid ambiguous paths

See merge request iris/iris!322

Update version in URL for Iris appendix

See merge request iris/iris!321