Speed up of particular inefficient part related to motions.

For these standard motions, the viewer likes to very frequently
flood-call startMotion/stopMotion sometimes, which at the very
least needs a LLUUID lookup in a std::map. In particular, this
is done for two of them for every avatar in the sim every frame.
This code makes it possible to test if that makes sense by
merely doing a bit test.

Conflicts:
	indra/llcharacter/llkeyframemotion.h

indra/llcharacter/llkeyframemotion.h

@@ -54,6 +54,7 @@
 class LLKeyframeDataCache;
 class LLVFS;
 class LLDataPacker;
+class LLMotionController;
 
 #define MIN_REQUIRED_PIXEL_AREA_KEYFRAME (40.f)
 #define MAX_CHAIN_LENGTH (4)
@@ -193,7 +194,7 @@ public:
 
 	// static constructor
 	// all subclasses must implement such a function and register it
-	static LLMotion *create(const LLUUID& id);
+	static LLMotion* create(LLUUID const& id, LLMotionController& controller);
 
 public:
 	//-------------------------------------------------------------------------