GFX control, no-tokio, no-async, dbus client refactor

- Working gfx modes <iGPU only, dGPU only, or hybrid>
- Add signal for gfx vendor change and make CLI wait for signal
- Add polling for led brightness to save to config
- Move daemon to zbus crate
- dbus client refactor
- Further dbus methods and updates
- Add basic notification user daemon and systemd service

asus-nb/src/dbus_gfx.rs

@@ -0,0 +1,39 @@
+// This code was autogenerated with `dbus-codegen-rust -s -d org.asuslinux.Daemon -p /org/asuslinux/Gfx -m None -f org.asuslinux.Daemon -c blocking`, see https://github.com/diwic/dbus-rs
+use dbus;
+#[allow(unused_imports)]
+use dbus::arg;
+use dbus::blocking;
+
+pub trait OrgAsuslinuxDaemon {
+    fn set_vendor(&self, vendor: &str) -> Result<(), dbus::Error>;
+}
+
+impl<'a, T: blocking::BlockingSender, C: ::std::ops::Deref<Target = T>> OrgAsuslinuxDaemon
+    for blocking::Proxy<'a, C>
+{
+    fn set_vendor(&self, vendor: &str) -> Result<(), dbus::Error> {
+        self.method_call("org.asuslinux.Daemon", "SetVendor", (vendor,))
+    }
+}
+
+#[derive(Debug)]
+pub struct OrgAsuslinuxDaemonNotifyGfx {
+    pub vendor: String,
+}
+
+impl arg::AppendAll for OrgAsuslinuxDaemonNotifyGfx {
+    fn append(&self, i: &mut arg::IterAppend) {
+        arg::RefArg::append(&self.vendor, i);
+    }
+}
+
+impl arg::ReadAll for OrgAsuslinuxDaemonNotifyGfx {
+    fn read(i: &mut arg::Iter) -> Result<Self, arg::TypeMismatchError> {
+        Ok(OrgAsuslinuxDaemonNotifyGfx { vendor: i.read()? })
+    }
+}
+
+impl dbus::message::SignalArgs for OrgAsuslinuxDaemonNotifyGfx {
+    const NAME: &'static str = "NotifyGfx";
+    const INTERFACE: &'static str = "org.asuslinux.Daemon";
+}