Metrics now include the current effect's name.

include/effect_matrix.h

@@ -56,14 +56,17 @@ public:
     MatrixEffect();
     virtual ~MatrixEffect();
     void loop();
+    String get_name() override { return "matrix"; }
 };
 
 class RainbowMatrixEffect : public MatrixEffect {
 public:
 	RainbowMatrixEffect();
+	String get_name() override { return "rainbow_matrix"; }
 };
 
 class RandomMatrixEffect : public MatrixEffect {
 public:
 	RandomMatrixEffect();
+	String get_name() override { return "random_matrix"; }
 };