Rebootless graphics switching

This changes out how the current graphics switching works, enabling
asusd to stop/start the display-manager to enable/disable PCI devices
and add/remove drivers as required.

All existing graphics modes and commands still work as normal.

G-Sync enable is now only through the bios setting, and on reboot
will set all relevant settings to Nvidia mode.

Cargo.lock

@@ -33,7 +33,7 @@ dependencies = [
 
 [[package]]
 name = "asusctl"
-version = "3.0.0"
+version = "3.1.0"
 dependencies = [
  "gumdrop",
  "rog_dbus",
@@ -187,7 +187,7 @@ dependencies = [
 
 [[package]]
 name = "daemon"
-version = "3.0.1"
+version = "3.1.0"
 dependencies = [
  "env_logger",
  "intel-pstate",