2 packages from ocsigen/lwt at 6.0.0~alpha01

[raphael-proust]

This pull-request concerns:

• lwt.6.0.0~alpha01: Promises and event-driven I/O
• lwt_direct.6.0.0~alpha01: Direct-style control-flow and await for Lwt

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• Homepage: https://github.com/ocsigen/lwt
• Source repo: git+https://github.com/ocsigen/lwt.git
• Bug tracker: https://github.com/ocsigen/lwt/issues

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🐫 Pull-request generated by opam-publish v2.5.1

[raphael-proust]

It seems to break lwt_log, which has been deprecated for a while anyway so maybe that's ok, I'll add a constraint

[raphael-proust]

I might have also broken some js uses, need to check if i broke all of them or just some

e.g.,

- (cd _build/default/test/js && /home/opam/.opam/4.14/bin/js_of_ocaml --no-source-map -o main.bc.js /home/opam/.opam/4.14/lib/cstruct/cstruct.js main.bc-for-jsoo)
- Warning [missing-primitive]: There are some missing primitives.
- Dummy implementations (raising 'Failure' exception) will be used if they are not available at runtime.
- You can prevent the generation of dummy implementations with the commandline option '--disable genprim'
- Missing primitives:
-   caml_mutex_lock
-   caml_mutex_new
-   caml_mutex_unlock
-   caml_thread_id
-   caml_thread_initialize
-   caml_thread_self
- File "test/js/dune", lines 3-7, characters 0-90:
- 3 | (rule
- 4 |  (alias runtest)
- 5 |  (package tezt)
- 6 |  (deps main.bc.js)
- 7 |  (action (run node main.bc.js)))
- (cd _build/default/test/js && /usr/bin/node main.bc.js)
- Fatal error: exception Failure("caml_thread_initialize not implemented")
[ERROR] The compilation of tezt.4.0.0 failed at "dune runtest -p tezt -j 71".

[raphael-proust]

A few packages broken by the removal of Lwt_main.*hooks (same that breaks lwt_log). These have been deprecated for a while with an alternative available for a while. So I don't think it's a blocker for an alpha release, but i'll need to ping all the affected packages.