Adds footstep sound variety, makes diving and clown suits have unique footstep sounds!

https://puu.sh/yQ8fs/61e12f15c6.webm
TODO: Get rid of the "damagesoundtype" system and replace it with simple "tag" checking to allow customizability from content pack side
Fix damagemodifier sounds never being played (I've never once heard LimbArmor play on anything but mantis)

Barotrauma/BarotraumaClient/Source/Sounds/Sound.cs

@@ -87,6 +87,10 @@ namespace Barotrauma
                 DebugConsole.ThrowError("File \"" + file + "\" not found!");
                 return null;
             }
+
+            Sound dupe = Sound.loadedSounds.Find(s => s.filePath == file);
+            if (dupe != null)
+                return dupe;
             
             return new Sound(file, destroyOnGameEnd);
         }
@@ -100,6 +104,9 @@ namespace Barotrauma
             {
                 newSound.baseVolume = element.GetAttributeFloat("volume", 1.0f);
                 newSound.range = element.GetAttributeFloat("range", 1000.0f);
+                Sound dupe = Sound.loadedSounds.Find(s => s.filePath == filePath && s.baseVolume == newSound.baseVolume && s.range == newSound.range);
+                if (dupe != null)
+                    return dupe;
             }
 
             return newSound;

Barotrauma/BarotraumaClient/Source/Sounds/SoundPlayer.cs

@@ -271,7 +271,7 @@ namespace Barotrauma
         public static Sound GetSound(string soundTag)
         {
             var matchingSounds = miscSounds[soundTag].ToList();
-            if (matchingSounds.Count == 0) return null;
+            if (matchingSounds.Count == 0) return Sound.Load(soundTag);
 
             return matchingSounds[Rand.Int(matchingSounds.Count)];
         }