Adds playable instruments, IDropped, IHandSelected and IHandDese… (#368)

* Instrument test.

* Midi stuff

* Some more work

* This actually works now!

* update

* Midi Audio works!

* Lots of stuff, and cool interfaces for items

* Update

* Fix a few things

* It just works

* Move textures to another folder, remove placeholder description from instruments

* Fix warning

* Use renderer enum

* Instruments now use DisposeRenderer method, and send MidiEvents as they receive them. Deletes InstrumentSystem whoo.

* Fix incorrect sprite paths

* Instruments take midi file size check into account when enabling/disabling midi playback buttons

* Fix crash when pressing drop on empty hand.

* Use new renderer return values for midi/input

* Xylophones are no longer handheld instruments, fix their sprites.

* Use new API

* Remove nfluidsynth from solution

* Timing information

* Use IGameTiming.CurTime for timestamps instead

Content.Server/GameObjects/EntitySystems/ActionBlockerSystem.cs

@@ -15,6 +15,8 @@ namespace Content.Server.GameObjects.EntitySystems
 
         bool CanSpeak();
 
+        bool CanDrop();
+
         bool CanEmote();
     }
 
@@ -70,6 +72,16 @@ namespace Content.Server.GameObjects.EntitySystems
             return canspeak;
         }
 
+        public static bool CanDrop(IEntity entity)
+        {
+            bool candrop = true;
+            foreach (var actionblockercomponents in entity.GetAllComponents<IActionBlocker>())
+            {
+                candrop &= actionblockercomponents.CanDrop();
+            }
+            return candrop;
+		}
+            
         public static bool CanEmote(IEntity entity)
         {
             bool canemote = true;