Avoid movement jitter (#13093)

This allows the client and server to agree on the position of objects and attached players even when there is lag.

src/constants.h

@@ -56,6 +56,13 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 // Override for the previous one when distance of block is very low
 #define BLOCK_SEND_DISABLE_LIMITS_MAX_D 1
 
+/*
+    Client/Server
+*/
+
+// Limit maximum dtime in client/server step(...) and for collision detection
+#define DTIME_LIMIT 2.5f
+
 /*
     Map-related things
 */