Re-implement: Qemu Hotplug

[Tinyblargon]

Hotplug should use the following struct. When the value is nil we wont change the value in PVE, this means that for updates we need to know the current settings. Defaults to false when nil during creation.

type QemuHotplug struct {
	Disk    *bool `json:"disk,omitempty"`
	Network *bool `json:"network,omitempty"`
	USB     *bool `json:"usb,omitempty"`
	Memory  *bool `json:"memory,omitempty"`
	CPU     *bool `json:"cpu,omitempty"`
}