Major refactoring of appearance handling.

AvatarService -- add two new methods, GetAppearance and SetAppearance
to get around the lossy encoding in AvatarData. Preseve the old
functions to avoid changing the behavior for ROBUST services.

AvatarAppearance -- major refactor, moved the various encoding
methods used by AgentCircuitData, ClientAgentUpdate and
ScenePresence into one location. Changed initialization.

AvatarAttachments -- added a class specifically to handle
attachments in preparation for additional functionality
that will be needed for viewer 2.

AvatarFactory -- removed a number of unused or methods duplicated
in other locations. Moved in all appearance event handling from
ScenePresence. Required a change to IClientAPI that propogated
throughout all the IClientAPI implementations.

OpenSim/Framework/Tests/AgentCircuitDataTest.cs

@@ -65,9 +65,7 @@ namespace OpenSim.Framework.Tests
             SessionId = UUID.Random();
 
             AvAppearance = new AvatarAppearance(AgentId);
-            AvAppearance.SetDefaultWearables();
             VisualParams = new byte[218];
-            AvAppearance.SetDefaultParams(VisualParams);
 
             //body
             VisualParams[(int)AvatarAppearance.VPElement.SHAPE_HEIGHT] = 155;