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Update toolchain build for gcc 12

Fix qemu deprecations

Fix constexpr errors

Remove unused output sections and try putting dummy section first workaround

Try putting UEFI at 4G to see if it fixes ld. Nope.

Try to work around ld breaking uefi link

Mass commit

Unmangle assert symbols

Fix poor use of ALIGN

Fix typo in CI run command

Huge improvements in all bootloaders

Update README, CI yaml

Build OS specific toolchain!