Update and Sync Mutelist with upstream alchemy

Satisfies the feature request for mute toggle to display mute status
Adds dynamic mute/unmute option to P2P IM dropdown.

Translators should look into the changes made in this commit for:
floater_chat_history.xml, floater_instant_message.xml, floater_instant_message_concisebuttons.xml
panel_avatar.xml has been taken care of for spanish and french, although they should be looked into more closely by the translators.

Cleanup and Sync in related places~
Removal of old static callbacks.
Moves God Names logic into LFSimFeatureHandler
Adds a custom function LLMuteList::hasMute() for quickly checking if a mute is in the internal set.

indra/newview/llpanelavatar.h

@@ -38,6 +38,7 @@
 #include "lluuid.h"
 #include "llmediactrl.h"
 #include "llavatarpropertiesprocessor.h"
+#include "llmutelist.h"
 
 class LLAvatarName;
 class LLCheckBoxCtrl;
@@ -99,6 +100,7 @@ public:
 
 class LLPanelAvatarSecondLife
 : public LLPanelAvatarTab
+, public LLMuteListObserver
 {
 public:
 	LLPanelAvatarSecondLife(const std::string& name, const LLRect &rect, LLPanelAvatar* panel_avatar );
@@ -108,6 +110,8 @@ public:
 	/*virtual*/ void refresh();
 
 	/*virtual*/ void processProperties(void* data, EAvatarProcessorType type);
+	/*virtual*/ void onChange() {}
+	/*virtual*/ void onChangeDetailed(const LLMute& mute);
 
 	void onClickImage();
 	void onClickFriends();