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/keyboard_led.rs

@@ -0,0 +1,59 @@
+use std::path::PathBuf;
+
+use log::warn;
+
+use crate::{
+    attr_u8, attr_u8_array,
+    error::{PlatformError, Result},
+    to_device,
+};
+
+#[derive(Debug, Default, PartialEq, PartialOrd)]
+pub struct KeyboardLed(PathBuf);
+
+impl KeyboardLed {
+    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("leds").map_err(|err| {
+            warn!("{}", err);
+            PlatformError::Udev("match_subsystem failed".into(), err)
+        })?;
+
+        enumerator
+            .match_sysname("asus::kbd_backlight")
+            .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::kbd_backlight not found".into(),
+        ))
+    }
+
+    attr_u8!(has_brightness, get_brightness, set_brightness, "brightness");
+
+    attr_u8_array!(
+        has_keyboard_rgb_mode,
+        get_keyboard_rgb_mode,
+        set_keyboard_rgb_mode,
+        "kbd_rgb_mode"
+    );
+
+    attr_u8_array!(
+        has_keyboard_rgb_state,
+        get_keyboard_rgb_state,
+        set_keyboard_rgb_state,
+        "kbd_rgb_state"
+    );
+}