Rublight sparkle is played when someone steps on it. (#2534)

In this case, "someone" means the player, a walking badguy, or an explosion. More of a feature than a fix. Also changed light colour to white to match current sprite.

data/images/objects/rublight/rublight.sprite

@@ -1,22 +1,22 @@
-(supertux-sprite
-  (action
-    (name "default")
-	(fps 8)
-	(images "rublight-0.png"
-			"rublight-1.png"
-			"rublight-2.png"
-			"rublight-3.png"
-			"rublight-4.png"
-			"rublight-5.png"
-			"rublight-6.png"
-			"rublight-7.png"
-			"rublight-8.png"
-			"rublight-9.png"
-			"rublight-10.png"
-			"rublight-0.png"
-			"rublight-0.png"
-			"rublight-0.png"
-			"rublight-0.png"
-			"rublight-0.png")
-  )
-)
+(supertux-sprite
+  (action
+    (name "active")
+	(fps 8)
+  (loops 1)
+	(images "rublight-0.png"
+			"rublight-1.png"
+			"rublight-2.png"
+			"rublight-3.png"
+			"rublight-4.png"
+			"rublight-5.png"
+			"rublight-6.png"
+			"rublight-7.png"
+			"rublight-8.png"
+			"rublight-9.png"
+			"rublight-10.png")
+  )
+  (action
+    (name "inactive")
+	(images "rublight-0.png")
+  )
+)

src/object/rublight.cpp

@@ -33,11 +33,11 @@ RubLight::RubLight(const ReaderMapping& mapping) :
   stored_energy(0),
   light(SpriteManager::current()->create(
     "images/objects/lightmap_light/lightmap_light.sprite")),
-  color(1.0f, 0.5f, 0.3f),
+  color(1.f, 1.f, 1.f),
   fading_speed(5.0f),
   strength_multiplier(1.0f)
 {
-  m_sprite->set_action("normal");
+  m_sprite->set_action("inactive");
 
   std::vector<float> vColor;
   if (mapping.get("color", vColor))
@@ -95,6 +95,7 @@ void RubLight::rub(float strength)
 {
   if (strength <= 0)
     return;
+  m_sprite->set_action("active");
   strength *= strength_multiplier;
   stored_energy = std::max<float>(stored_energy, strength);
   if (state == STATE_DARK)
@@ -104,9 +105,14 @@ void RubLight::rub(float strength)
 void
 RubLight::update(float dt_sec)
 {
+  if (m_sprite->get_action() == "active" && m_sprite->animation_done())
+  {
+    m_sprite->set_action("inactive");
+  }
+
   switch (state) {
   case STATE_DARK:
-    // Nothing to do
+    m_sprite->set_action("inactive");
     break;
 
   case STATE_FADING: