Added FireEffect. Its values still need a bit of tweaking to look right...

include/config.sample.h

@@ -57,6 +57,9 @@
 #define EFFECT_SNAKE_DIRECTION_CHANGE 10
 #define EFFECT_SNAKE_SLOWDOWN 2
 
+#define EFFECT_FIRE_COOLDOWN 192
+#define EFFECT_FIRE_SPARK_CHANCE 5
+
 #ifdef DEBUG
   #define LOG(x) mqtt_log(x); Serial.print(x);
   #define LOGln(x) mqtt_log_ln(x); Serial.println(x);