[Ready] SoundComponent (#164)

Requires https://github.com/space-wizards/space-station-14/pull/768

- [x] Play sounds
- [x] SoundSchedules actually work
- [x] Send sound to specific users
- [x] Make existing components use SoundComponent
- [x] Add ScheduledSounds from prototypes
- [x] Add Play methods equivalent to those of AudioSystem.
- [x] Document most code.

Content.Server/GameObjects/Components/Sound/SoundComponent.cs

@@ -0,0 +1,72 @@
+using System.Collections.Generic;
+using Content.Shared.GameObjects.Components.Sound;
+using SS14.Server.GameObjects.EntitySystems;
+using SS14.Shared.Audio;
+using SS14.Shared.GameObjects;
+using SS14.Shared.Interfaces.GameObjects;
+using SS14.Shared.Interfaces.Network;
+using SS14.Shared.Log;
+using SS14.Shared.Map;
+using SS14.Shared.Serialization;
+
+namespace Content.Server.GameObjects.Components.Sound
+{
+    public class SoundComponent : SharedSoundComponent
+    {
+        /// <summary>
+        /// Stops all sounds.
+        /// </summary>
+        /// <param name="channel">User that will be affected.</param>
+        public void StopAllSounds(INetChannel channel)
+        {
+            SendNetworkMessage(new StopAllSoundsMessage(), channel);
+        }
+
+        /// <summary>
+        /// Stops a certain scheduled sound from playing.
+        /// </summary>
+        /// <param name="channel">User that will be affected.</param>
+        public void StopScheduledSound(string filename, INetChannel channel)
+        {
+            SendNetworkMessage(new StopSoundScheduleMessage(){Filename = filename}, channel);
+        }
+
+        /// <summary>
+        /// Adds an scheduled sound to be played.
+        /// </summary>
+        /// <param name="channel">User that will be affected.</param>
+        public void AddScheduledSound(ScheduledSound schedule, INetChannel channel)
+        {
+            SendNetworkMessage(new ScheduledSoundMessage() {Schedule = schedule}, channel);
+        }
+
+        public override void StopAllSounds()
+        {
+            StopAllSounds(null);
+        }
+
+        public override void StopScheduledSound(string filename)
+        {
+            StopScheduledSound(filename, null);
+        }
+
+        public override void AddScheduledSound(ScheduledSound schedule)
+        {
+            AddScheduledSound(schedule, null);
+        }
+
+        /// <summary>
+        ///     Play an audio file following the entity.
+        /// </summary>
+        /// <param name="filename">The resource path to the OGG Vorbis file to play.</param>
+        /// <param name="channel">User that will be affected.</param>
+        public void Play(string filename, AudioParams? audioParams = null, INetChannel channel = null)
+        {
+            AddScheduledSound(new ScheduledSound()
+            {
+                Filename = filename,
+                AudioParams = audioParams,
+            }, channel);
+        }
+    }
+}