qemu: Enable hardware acceleration on Windows

[afbjorklund]

And document the default "tcg" fallback accel

Issue #15709

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[afbjorklund]

It needs to be -accel whpx,kernel-irqchip=off to avoid an issue when enabling the accel

And for some reason -cpu max doesn't work, so it needs to be -cpu qemu64 instead

[afbjorklund]

But there are other issues too, the QMP needs to use tcp: rather than unix:

And the APIServer tunneling through SSH seems to be failing (exit code 255)