Instead of loading default avatar animations in both SLUtil and AvatarAnimations, load just in AvatarAnimations instead.

This lets us remove the dependency of OpenSim.Framework.dll on data/avataranimations.xml, which is not necessary for ROBUST.
This commit also takes care of the odd situation where animations are stored and used internally with uppercase names (e.g. "STAND")
but scripts refer to them with lowercase names (e.g. "sit").

OpenSim/Framework/IClientAPI.cs

@@ -1215,10 +1215,9 @@ namespace OpenSim.Framework
         /// <param name="OrbitalPosition">The orbital position is given in radians, and must be "adjusted" for the linden client, see LLClientView</param>
         void SendSunPos(Vector3 sunPos, Vector3 sunVel, ulong CurrentTime, uint SecondsPerSunCycle, uint SecondsPerYear,
                         float OrbitalPosition);
-
+        
         void SendViewerEffect(ViewerEffectPacket.EffectBlock[] effectBlocks);
         void SendViewerTime(int phase);
-        UUID GetDefaultAnimation(string name);
 
         void SendAvatarProperties(UUID avatarID, string aboutText, string bornOn, Byte[] charterMember, string flAbout,
                                   uint flags, UUID flImageID, UUID imageID, string profileURL, UUID partnerID);