Advanced Aura feature

Groundwork for 'advanced' aura modes
Add single zone + Doom light flash
Fix mocking for ROGCC
Better prepare & change to mapping of keyboard layouts to models and functions
Refactor and begin using new key layout stuff
Enable first arg to rogcc to set layout in mocking feature mode
Complete refactor of key layouts, and to RON serde

rog-aura/src/effects/breathe.rs

@@ -0,0 +1,82 @@
+use serde::{Deserialize, Serialize};
+
+use super::EffectState;
+use crate::advanced::LedCode;
+use crate::layouts::KeyLayout;
+use crate::{effect_state_impl, Colour, Speed};
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct Breathe {
+    address: LedCode,
+    /// The starting colour
+    start_colour1: Colour,
+    /// The secondary starting colour
+    start_colour2: Colour,
+    /// The speed at which to cycle between the colours
+    speed: Speed,
+    /// Temporary data to help keep state
+    #[serde(skip)]
+    colour: Colour,
+    #[serde(skip)]
+    count_flipped: bool,
+    #[serde(skip)]
+    use_colour1: bool,
+}
+
+impl Breathe {
+    pub fn new(address: LedCode, colour1: Colour, colour2: Colour, speed: Speed) -> Self {
+        Self {
+            address,
+            start_colour1: colour1,
+            start_colour2: colour2,
+            speed,
+            colour: colour1,
+            count_flipped: false,
+            use_colour1: true,
+        }
+    }
+}
+
+impl EffectState for Breathe {
+    effect_state_impl!();
+
+    fn next_colour_state(&mut self, _layout: &KeyLayout) {
+        let Self {
+            start_colour1: colour1,
+            start_colour2: colour2,
+            speed,
+            colour: colour_actual,
+            count_flipped: flipped,
+            use_colour1,
+            ..
+        } = self;
+
+        let speed = 4 - <u8>::from(*speed);
+
+        if *colour_actual == Colour(0, 0, 0) {
+            *use_colour1 = !*use_colour1;
+        }
+
+        let colour = if !*use_colour1 { colour2 } else { colour1 };
+
+        let r1_scale = colour.0 / speed / 2;
+        let g1_scale = colour.1 / speed / 2;
+        let b1_scale = colour.2 / speed / 2;
+
+        if *colour_actual == Colour(0, 0, 0) {
+            *flipped = true;
+        } else if colour_actual >= colour {
+            *flipped = false;
+        }
+
+        if !*flipped {
+            colour_actual.0 = colour_actual.0.saturating_sub(r1_scale);
+            colour_actual.1 = colour_actual.1.saturating_sub(g1_scale);
+            colour_actual.2 = colour_actual.2.saturating_sub(b1_scale);
+        } else {
+            colour_actual.0 = colour_actual.0.saturating_add(r1_scale);
+            colour_actual.1 = colour_actual.1.saturating_add(g1_scale);
+            colour_actual.2 = colour_actual.2.saturating_add(b1_scale);
+        }
+    }
+}