Installer design

Implemented in 5.3.0

action	install	update/repair	uninstall	remarks
detach --all		X		Stubs will not use VBoxUSB after this.
delay (1)		X		Delay (2 seconds) for detach to finish.
disable_forced		X		VBoxUSB will not be used after this. NOTE: Must be non-fatal, in case the previous version does not have this!
unbind --all			X	Stops all sharing (forced or not). VBoxUSB will not be used after this.
delay (2)			X	Delay (2 seconds) for unbind to finish.
uninstall_stubs (1)			X	Cleanup device tree.
uninstall_old_drivers (1)			X	Cleanup drivers.
uninstall_driver			X	Cleanup drivers.
MSI: StopServices				Before VBoxUSBMon can stop, VBoxUSB must not be used. Schedule actions to accomplish that before StopServices.
MSI: InstallFiles				No actions depending on usbipd for install, files/registry would not be available. Schedule any actions before InstallServices to ensure they come after all of these.
uninstall_stubs (2)	X	X		Cleanup device tree.
install_driver	X	X		Make (PnP) driver available for future stubs.
install_monitor	X	X		Install VBoxUSBMon service (cannot use InstallService because it is kernel mode). Stopping and deleting is handled by MSI (StopServices / DeleteServices).
MSI: InstallServices				Will install usbipd service, which depends on VBoxUSBMon. Schedule custom installation of VBoxUSBMon before InstallServices.
MSI: StartServices				Will start usbipd, which depends on VBoxUSBMon, which will therefore also be started. Schedule actions that require VBoxUSBMon running after StartServices.
update_drivers	X	X		Update all drivers. Driver will actually be loaded, because the device will be enabled by this. Should be only forced devices. Should be no-op for install, but it can't hurt. Schedule after StartServices, or the new VBoxUSB will fail to load (requires VBoxUSBMon). NOTE: Windows cannot update phantom devices. This function will cause them to become unforced instead.
uninstall_old_drivers (2)	X	X		Cleanup drivers. Also on install, to clean up after previous versions that did not have this. Schedule after update_drivers
enable_forced	X	X		Schedule after StartServices, or the VBoxUSB will fail to load (requires VBoxUSBMon). Should be no-op for install, but it can't hurt.