Update Floater World Map, add support for worldmap and maptrackavatar slurls (Find on map and show pick on map in web profiles)

Cleaned up includes, switched callbacks over to mCommitCallbackRegistrar, updated RLVa portions to RLVa 1.4.5, changed mSLURL from a string to a real SLURL

indra/newview/llworldmapview.h

@@ -81,6 +81,8 @@ public:
 	static void		setScale( F32 scale );
 	static void		translatePan( S32 delta_x, S32 delta_y );
 	static void		setPan( S32 x, S32 y, BOOL snap = TRUE );
+	// Return true if the current scale level is above the threshold for accessing region info
+	static bool		showRegionInfo();
 
 	LLVector3		globalPosToView(const LLVector3d& global_pos);
 	LLVector3d		viewPosToGlobal(S32 x,S32 y);