Final round of fixes for new version

rog-client/examples/comet.rs

@@ -0,0 +1,28 @@
+use rog_client::{AuraDbusWriter, GX502Layout, KeyColourArray, KeyLayout};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut writer = AuraDbusWriter::new()?;
+
+    let layout = GX502Layout::default();
+
+    writer.init_effect()?;
+    let rows = layout.get_rows();
+
+    let mut column = 0;
+    loop {
+        let mut key_colours = KeyColourArray::new();
+        for row in rows {
+            if let Some(c) = key_colours.key(row[column as usize]) {
+                *c.0 = 255;
+            };
+        }
+        if column == rows[0].len() - 1 {
+            column = 0
+        } else {
+            column += 1;
+        }
+
+        writer.write_colour_block(&key_colours)?;
+        std::thread::sleep(std::time::Duration::from_millis(250));
+    }
+}