Attempt to speed up agent idle update by optimizing wearable/visualparam related lookups/iterations a bit more.

Generalized several templates in llstl.h in order to support more containers.
Removed several instances of is_in_map/getWearableCount being followed immediately by another lookup with the same key. find is more efficient, as we get an iterator to use instead of a simple boolean.

indra/llcharacter/llmotioncontroller.cpp

@@ -83,13 +83,7 @@ LLMotionRegistry::~LLMotionRegistry()
 BOOL LLMotionRegistry::registerMotion( const LLUUID& id, LLMotionConstructor constructor )
 {
 	//	llinfos << "Registering motion: " << name << llendl;
-	if (!is_in_map(mMotionTable, id))
-	{
-		mMotionTable[id] = constructor;
-		return TRUE;
-	}
-	
-	return FALSE;
+	return mMotionTable.insert(std::make_pair(id,constructor)).second;
 }
 
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