externalize pixel stuff, add pixel instance to plugin, remove old code

src/PixelPlugin.cpp

@@ -4,10 +4,42 @@ PixelPlugin::PixelPlugin(NeoPixelConfig cfg, NeoPattern *neoPattern)
 {
     pixelConfig = cfg;
     pixels = neoPattern;
-    pixels->begin();
+    applyConfig(pixelConfig);
+    defaultAnimation();
+}
+
+PixelPlugin::PixelPlugin(NeoPattern *neoPattern)
+{
+    pixels = neoPattern;
+    loadConfigFromFile();
+    applyConfig(pixelConfig);
+    defaultAnimation();
+}
+
+PixelPlugin::PixelPlugin()
+{
+    loadConfigFromFile();
+    pixels = new NeoPattern(pixelConfig.length, pixelConfig.pin, NEO_GRB + NEO_KHZ800);
+    applyConfig(pixelConfig);
+    defaultAnimation();
+}
+
+void PixelPlugin::loadConfigFromFile(){
+    if (SPIFFS.begin()){
+        pixelConfig.fromFile(PIXEL_CONFIG_FILE);
+    }
+}
+
+void PixelPlugin::applyConfig(NeoPixelConfig cfg)
+{
     pixels->setBrightness(pixelConfig.brightness);
 }
 
+void PixelPlugin::defaultAnimation() {
+    pixels->RainbowCycle(pixelConfig.updateInterval);
+    animate();
+}
+
 void PixelPlugin::activate(Scheduler *userScheduler, Network *network)
 {
     subscribe("pixels/colorWheel", bind(&PixelPlugin::colorWheel, this, _1));