Make coq-mode work without generic/proof-*

Revise the various `require`s to avoid spurious dependencies, and tweak
the code here and there to eliminate the remaining dependencies.

* coq/coq-db.el: Don't require proof-config nor proof-syntax.
(coq-build-opt-regexp-from-db): Avoid proof-regexp-alt-list.

* coq/coq-indent.el: Use lexical-binding.  Don't require coq-syntax.
Comment out all the code that's not used any more.
(coq-empty-command-p): Use forward-comment instead of
coq-find-not-in-comment-backward.  Fix paren typos.
(coq-script-parse-cmdend-forward, coq-script-parse-cmdend-backward):
Use forward-comment i.s.o proof-script-generic-parse-find-comment-end.
Use syntax-ppss i.s.o proof-buffer-syntactic-context.
(coq-find-current-start): Explicit case-fold-search i.s.o proof-looking-at.

* coq/coq-mode.el (coq-mode): Set comment-start/end.

* coq/coq-smie.el: Require coq-syntax explicitly.
(coq-smie-detect-goal-command, coq-smie-module-deambiguate):
Explicit case-fold-search i.s.o proof-looking-at.
(coq-indent-basic): New custom var.
(coq-smie-rules): Use it in case PG is not loaded.

* coq/coq-syntax.el: Don't require proof-syntax, proof-utils, and span.
(coq-goal-command-p): Use overlay-get i.s.o span-property.
(coq-save-command-regexp-strict, coq-save-command-regexp):
Use \` and regexp-opt i.s.o proof-anchor-regexp and proof-ids-to-regexp.
(coq-save-command-p): Explicit case-fold-search i.s.o proof-string-match.
(coq--regexp-alt-list-symb): Rename from proof-regexp-alt-list-symb.
Use mapconcat i.s.o proof-regexp-alt-list.
(coq-save-with-hole-regexp): Use regexp-opt i.s.o proof-regexp-alt-list.
(coq-goal-command-regexp, coq-goal-with-hole-regexp)
(coq-decl-with-hole-regexp, coq-defn-with-hole-regexp)
(coq-font-lock-keywords-1): Use mapconcat i.s.o proof-regexp-alt-list.
(coq-find-first-hyp, coq-detect-hyps-positions-in-goals):
Use current buffer i.s.o proof-goals-buffer.
(coq-with-altered-syntax-table): Fix broken use of unwind-protect.

* coq/coq.el (coq-detect-hyps-in-goals): Change buffer before calling
coq-find-first-hyp and coq-detect-hyps-positions-in-goals.
(coq-pg-setup): Use comment-start/end.

* generic/pg-goals.el: Require proof-script explicitly instead of
autoloading via proof-insert-sendback-command.

* generic/pg-pbrpm.el: Require proof-script explicitly instead of
autoloading via proof-insert-pbp-command.

* generic/pg-pgip.el: Require proof-script explicitly.

* generic/proof-depends.el: Require proof-script explicitly instead of
autoloading via pg-set-span-helphighlights.

* generic/proof-script.el (pg-set-span-helphighlights)
(proof-insert-pbp-command, proof-insert-sendback-command)
(proof-script-generic-parse-find-comment-end): Don't autoload.

* generic/proof-syntax.el (proof-ids-to-regexp): Simplify.

* lib/span.el (span-delete): η-reduce.

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