Only synch input states when they dirty

Sending dupe input state messages every 10 seconds is wasteful. They are
already sent when the fields dirty, so there's no sense in sending them
any more than that. For keeping the connection alive, we'll use
lightweight pings.

Sources/Plasma/PubUtilLib/plAvatar/plArmatureMod.h

@@ -414,7 +414,6 @@ protected:
     uint8_t fStealthMode;
     int fStealthLevel;  // you are invisible to other players/CCRs of lower stealthLevel
     
-    double      fLastInputSynch;
     plAGModifier * fRootAGMod;
     plAvBoneMap * fBoneMap;                 // uses id codes to look up bones. set up by the brain as needed.
     double fLastSynch;