qemu: Completely rewrite QMP client from scratch

It sucked. The new one is using Sans I/O principles, so it does not
directly do I/O or talk to a net.Socket directly (instead, QemuVM implements
the layer to do I/O). This means in the future this library could actually
be tested, but for now, I'm not bothering with that.

There's also some other cleanups that were bothering me.

package.json

@@ -12,7 +12,7 @@
 		"@parcel/packager-ts": "2.12.0",
 		"@parcel/transformer-sass": "2.12.0",
 		"@parcel/transformer-typescript-types": "2.12.0",
-		"@types/node": "^20.12.5",
+		"@types/node": "^20.14.10",
 		"just-install": "^2.0.1",
 		"parcel": "^2.12.0",
 		"prettier": "^3.2.5",