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/llcharacter/llcharacter.cpp

@@ -50,7 +50,7 @@ BOOL LLCharacter::sAllowInstancesChange = TRUE ;
 // LLCharacter()
 // Class Constructor
 //-----------------------------------------------------------------------------
-LLCharacter::LLCharacter(bool freeze_time)
+LLCharacter::LLCharacter()
 	: 
 	mPreferredPelvisHeight( 0.f ),
 	mSex( SEX_FEMALE ),
@@ -62,7 +62,6 @@ LLCharacter::LLCharacter(bool freeze_time)
 
 	mMotionController.setCharacter( this );
 	mPauseRequest = new LLPauseRequestHandle();
-	mFreezeTimeHidden = freeze_time;
 }