enable `preview=rvaluerefparam` by default

[thewilsonator]

https://forum.dlang.org/thread/[email protected]

Will add changelog soon

[dlang-bot]

Thanks for your pull request and interest in making D better, @thewilsonator! We are looking forward to reviewing it, and you should be hearing from a maintainer soon. Please verify that your PR follows this checklist:

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If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog.

Testing this PR locally

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dub run digger -- build "master + dmd#16778"

[thewilsonator]

Lolwot? I didn't close this.

[Geod24]

The gods of Github don't want this ;)

Wasn't it broken for most of its lifetime ? Quite curious what the CI will say.

[thewilsonator]

Wasn't it broken for most of its lifetime ?

Wasn't that noSharedAccess.

[dkorpel]

Superseded by https://github.com/dlang/dmd/pull/17068