Release 1.12.0

[straight-shoota]

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[beta-ziliani]

I left some fixes.

Overall I think it's too detailed and people might get bored and miss the important bits. I rather remove bugfixes/improvements without much impact on the final user. This is a proposed list of things to remove:

• Init schedulers before we spawn fibers (#14339).
• Use per-scheduler stack pools (let’s recycle) (#14100).
• Reserve stack space on non-main threads for crash recovery on Windows (#14187).
  (Maybe move it to the Windows section?)
• Make equality between Complex and other numbers exact (#14309).
• Fix #hash for the Big* number types (#14308).
• Handle invalid parameter error in MSVC calls to prevent an immediate process exit (#14313)
• Crystal::System::FileDescriptor::Handle is a generic alias to the platform-specific type representing a file descriptor (#14390)
• Hash#update (#14417) and Hash#put_if_absent (#14427) no longer put duplicate keys if the block inserts the key.
• FileUtils.mv works across filesystems on Windows (#14320).
  (Maybe move to Windows section?)

And I'd just mention the several fixes in the formatter without being explicit.

[straight-shoota]

I dropped some of the less relevant bug fixes. But many that you mentioned are part of the current projects Concurrency/MT and Windows. I think it makes sense to mention a bit more details what's going on there.