Move std.experimental.all to std

[wilzbach]

std.experimental.all has been added more than a year ago (see #5916).

When we added it, we agreed to use experimental first to see whether there are any flaws with such a convenience package.
As none of these have been discovered and on the contrary more work has been started (and merged in some cases) which makes the compiler (or at least Phobos) compile faster.

Also, as the D community started to like this package, I think this was successful experiment and we should stabilize it.

BTW any interested reader can find a lot of examples of std.experimental.all in action in D forums posts.
A short excerpt:

• https://forum.dlang.org/post/vntsidmvowboxtfeduxp@forum.dlang.org
• https://forum.dlang.org/post/dqptwzycafzfvwwvyzni@forum.dlang.org
• https://forum.dlang.org/post/syguaofawaxbqfqqyxsw@forum.dlang.org
• https://forum.dlang.org/post/qlvexnrvjriyapolkepk@forum.dlang.org
• https://forum.dlang.org/post/bfvzlyzrzlcotisxqiur@forum.dlang.org
• https://forum.dlang.org/post/rfagavflrtfaisiicufz@forum.dlang.org
• https://forum.dlang.org/post/jkiymjpdqhaealytbqgo@forum.dlang.org
  ...

Also, once this is stabilized, I can finally enable it by default for run.dlang.io.

[dlang-bot]

Thanks for your pull request, @wilzbach!

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "master + phobos#6889"

[thewilsonator]

Huh?

Error: linker exited with status 1
Makefile:209: recipe for target 'generated/sanitize_json' failed
make[1]: *** [generated/sanitize_json] Error 1
make[1]: *** Waiting for unfinished jobs....
../../phobos/generated/linux/release/32/libphobos2.so: undefined reference to `_D3std12__ModuleInfoZ'

[ghost]

looks good to me, let's get the merge

[PetarKirov]

Thanks for doing this, I'm strongly in favor!
It needs a little bit of work on the ddoc side, but I think this can only be done in the dlang/dlang.org repo after this PR is merged. (E.g. we need to link the std/package.d docs from more places.)

[PetarKirov]

Hey @wilzbach, you up for finishing this PR?

[PetarKirov]

@andralex do we have a go or no go from your side?

[andralex]

Couple of changes requested. Let's do this, thanks for the work.

[wilzbach]

OK. I went through the comments and also added a proper deprecation message for std.experimental.all.

-> this should be good to go now (:

CC @thewilsonator

Addressed

[thewilsonator]

Automerge added.

[wilzbach]

Force merging as Walter's recent -dip1000 push broke CircleCi.