Create rog-platform, refactor rogcc ipc-file handling

- Create new rog-platform crate to manage all i/o in a universal way
  + kbd-led handling
  + platform handling (asus-nb-wmi)
  + hidraw
  + usbraw
- Refactor how ROGCC handles IPC for background open, run-in-bg

rog-platform/src/platform.rs

@@ -0,0 +1,69 @@
+use std::path::PathBuf;
+
+use log::warn;
+
+use crate::{
+    attr_bool,
+    error::{PlatformError, Result},
+    to_device,
+};
+
+/// The "platform" device provides access to things like:
+/// - dgpu_disable
+/// - egpu_enable
+/// - panel_od
+/// - dgpu_only
+/// - keyboard_mode, set keyboard RGB mode and speed
+/// - keyboard_state, set keyboard power states
+#[derive(Debug, PartialEq, PartialOrd)]
+pub struct AsusPlatform(PathBuf);
+
+impl AsusPlatform {
+    pub fn new() -> Result<Self> {
+        let mut enumerator = udev::Enumerator::new().map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("enumerator failed".into(), err)
+        })?;
+        enumerator.match_subsystem("platform").map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("match_subsystem failed".into(), err)
+        })?;
+        enumerator.match_sysname("asus-nb-wmi").map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("match_subsystem failed".into(), err)
+        })?;
+
+        for device in enumerator.scan_devices().map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("scan_devices failed".into(), err)
+        })? {
+            return Ok(Self(device.syspath().to_owned()));
+        }
+        Err(PlatformError::MissingFunction(
+            "asus-nb-wmi not found".into(),
+        ))
+    }
+
+    attr_bool!(
+        has_dgpu_disable,
+        get_dgpu_disable,
+        set_dgpu_disable,
+        "dgpu_disable"
+    );
+
+    attr_bool!(
+        has_egpu_enable,
+        get_egpu_enable,
+        set_egpu_enable,
+        "egpu_enable"
+    );
+
+    attr_bool!(has_panel_od, get_panel_od, set_panel_od, "panel_od");
+
+    attr_bool!(
+        has_gpu_mux_mode,
+        get_gpu_mux_mode,
+        set_gpu_mux_mode,
+        "gpu_mux_mode"
+    );
+}