[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, 2 insertions, 1 deletions

diff --git a/toplevel/coqargs.mli b/toplevel/coqargs.mli
index de9b6a682..9fb6219a6 100644
--- a/toplevel/coqargs.mli
+++ b/toplevel/coqargs.mli
@@ -27,7 +27,6 @@ type coq_cmdopts = {
   compilation_mode : compilation_mode;
 
   toplevel_name : Names.DirPath.t;
-  toploop : string option;
 
   compile_list: (string * bool) list;  (* bool is verbosity  *)
   compilation_output_name : string option;
@@ -56,6 +55,8 @@ type coq_cmdopts = {
   print_config: bool;
   output_context : bool;
 
+  print_emacs : bool;
+
   inputstate  : string option;
   outputstate : string option;