In FreezeTime mode, keep avatars that TP away.

If an avatar TP's away (or quits), he will not
disappear anymore from a frozen scene. Unfreezing
makes him disappear of course (and clean up).

Known bug: if during Freeze Time mode someone
TPs away and then back, then he becomes a cloud
after Freeze Time is ended, which can only be
reset by another teleport (or relog) from either
the cloud or the one seeing him as cloud.
I decided not to fix this, cause there are things
with a higher priority and this - if it happens
at all - is rare and easy to recognize and work
around.

indra/newview/llvoavatar.h

@@ -358,6 +358,8 @@ private:
 	S32				mVisualComplexity;
 	LLFrameTimer	mFullyLoadedTimer;
 	LLFrameTimer	mRuthTimer;
+	bool			mFreezeTimeHidden;		// True when this object was created during snapshot FreezeTime mode, and that mode is STILL active.
+	bool			mFreezeTimeDead;		// True when the avatar was marked dead (ie, TP-ed away) while in FreezeTime mode.
 protected:
 	LLFrameTimer    mInvisibleTimer;
 	
@@ -453,6 +455,7 @@ private:
 public:
 	U32 		renderImpostor(LLColor4U color = LLColor4U(255,255,255,255), S32 diffuse_channel = 0);
 	bool		isVisuallyMuted() const;
+	void		resetFreezeTime();
 
 	U32 		renderRigid();
 	U32 		renderSkinned(EAvatarRenderPass pass);