audio: add Sampler::StopSample() method.

src/sampler.cpp

@@ -60,5 +60,11 @@ void Sampler::PlaySample(int id)
     sample->Play();
 }
 
+void Sampler::StopSample(int id)
+{
+    Sample *sample = (Sample *)data->samples.GetEntity(id - 1);
+    sample->Stop();
+}
+
 } /* namespace lol */
 

src/sampler.h

@@ -29,6 +29,7 @@ public:
     static void Deregister(int id);
 
     static void PlaySample(int id);
+    static void StopSample(int id);
 
 private:
     Sampler() {}