[stm] Make toplevels standalone executables.

We turn coqtop "plugins" into standalone executables, which will be
installed in `COQBIN` and located using the standard `PATH`
mechanism. Using dynamic linking for `coqtop` customization didn't
make a lot of sense, given that only one of such "plugins" could be
loaded at a time. This cleans up some code and solves two problems:

- `coqtop` needing to locate plugins,
- dependency issues as plugins in `stm` depended on files in `toplevel`.

In order to implement this, we do some minor cleanup of the toplevel
API, making it functional, and implement uniform build rules. In
particular:

- `stm` and `toplevel` have become library-only directories,
- a new directory, `topbin`, contains the new executables,
- 4 new binaries have been introduced, for coqide and the stm.
- we provide a common and cleaned up way to locate toplevels.

1 files changed, 4 insertions, 6 deletions

diff --git a/toplevel/coqloop.mli b/toplevel/coqloop.mli
index 6d9867fb9..5c07a8bf3 100644
--- a/toplevel/coqloop.mli
+++ b/toplevel/coqloop.mli
@@ -10,9 +10,6 @@
 
 (** The Coq toplevel loop. *)
 
-(** -emacs option: printing includes emacs tags. *)
-val print_emacs : bool ref
-
 (** A buffer for the character read from a channel. We store the command
  * entered to be able to report errors without pretty-printing. *)
 
@@ -32,8 +29,9 @@ val set_prompt : (unit -> string) -> unit
 (** Toplevel feedback printer. *)
 val coqloop_feed : Topfmt.execution_phase -> Feedback.feedback -> unit
 
-(** Main entry point of Coq: read and execute vernac commands. *)
-val loop : state:Vernac.State.t -> Vernac.State.t
-
 (** Last document seen after `Drop` *)
 val drop_last_doc : Vernac.State.t option ref
+val drop_args : Coqargs.coq_cmdopts option ref
+
+(** Main entry point of Coq: read and execute vernac commands. *)
+val loop : opts:Coqargs.coq_cmdopts -> state:Vernac.State.t -> unit