feat: Enhance DALI Gateway with RGBW and RGBCW support

- Added support for RGBW and RGBCW color modes in the DALI Gateway.
- Updated JSON color mode parsing to handle new color types.
- Extended the StoreDt8SceneSnapshot function to include white, amber, and free color parameters.
- Introduced new methods in DaliGatewayBridge for setting RGBW, RGBCW, and RGBWAF colors.
- Modified KnxDaliChannel to send RGBW and RGBCW colors based on the color type.
- Updated parameter types and definitions in the KNX product XML files to accommodate new color modes.
- Enhanced README with migration details and validation instructions.

Signed-off-by: Tony <tonylu@tony-cloud.com>

components/gateway_bridge/src/gateway_bridge.cpp

@@ -1020,6 +1020,12 @@ DaliDt8SceneColorMode JsonColorMode(const cJSON* root) {
     if (item->valueint == 2) {
       return DaliDt8SceneColorMode::kRgb;
     }
+    if (item->valueint == 3) {
+      return DaliDt8SceneColorMode::kRgbw;
+    }
+    if (item->valueint == 4) {
+      return DaliDt8SceneColorMode::kRgbcw;
+    }
     return DaliDt8SceneColorMode::kDisabled;
   }
   if (!cJSON_IsString(item) || item->valuestring == nullptr) {
@@ -1032,6 +1038,12 @@ DaliDt8SceneColorMode JsonColorMode(const cJSON* root) {
   if (mode == "rgb") {
     return DaliDt8SceneColorMode::kRgb;
   }
+  if (mode == "rgbw") {
+    return DaliDt8SceneColorMode::kRgbw;
+  }
+  if (mode == "rgbcw" || mode == "rgbWwCw" || mode == "rgb_cw") {
+    return DaliDt8SceneColorMode::kRgbcw;
+  }
   return DaliDt8SceneColorMode::kDisabled;
 }
 
@@ -1049,6 +1061,15 @@ GatewayBridgeHttpResponse StoreDt8SceneSnapshot(DaliDomainService& domain, uint8
   const int red = JsonIntAny(root, "red", "r").value_or(0);
   const int green = JsonIntAny(root, "green", "g").value_or(0);
   const int blue = JsonIntAny(root, "blue", "b").value_or(0);
+  const int white = JsonIntAny(root, "white", "w")
+                        .value_or(JsonIntAny(root, "coolWhite", "cool_white")
+                                      .value_or(JsonInt(root, "cw").value_or(0)));
+  const int amber = JsonIntAny(root, "amber", "a")
+                        .value_or(JsonIntAny(root, "warmWhite", "warm_white")
+                                      .value_or(JsonInt(root, "ww").value_or(0)));
+  const int freecolour = JsonIntAny(root, "freecolour", "freeColor").value_or(255);
+  const int rgbwaf_control = JsonIntAny(root, "rgbwafControl", "rgbwaf_control")
+                                 .value_or(JsonInt(root, "control").value_or(-1));
   cJSON_Delete(root);
 
   if (!address.has_value() || !scene.has_value() || !brightness.has_value() ||
@@ -1057,7 +1078,7 @@ GatewayBridgeHttpResponse StoreDt8SceneSnapshot(DaliDomainService& domain, uint8
   }
   if (!domain.storeDt8SceneSnapshot(gateway_id, address.value(), scene.value(),
                                     brightness.value(), color_mode, color_temperature, red,
-                                    green, blue)) {
+                                    green, blue, white, amber, freecolour, rgbwaf_control)) {
     return ErrorResponse(ESP_FAIL, "failed to store DT8 scene snapshot");
   }
   return StoredSnapshotResponse(domain.dt8SceneColorReport(gateway_id, address.value(),