Add sm_gotocouch & effect intensity

Couch/scripting/include/Couch.inc

@@ -67,6 +67,15 @@ native int Couch_Spawn(int client);
  */
 native bool Couch_Bring(int client);
 
+/**
+ * Teleports the client onto the couch, or beside it when the top is blocked. The client keeps
+ * their view angles and arrives with no velocity.
+ *
+ * @param client            Client to teleport. Must be in game.
+ * @return                  True on success, false if there is no couch.
+ */
+native bool Couch_Goto(int client);
+
 /**
  * Removes the couch and forgets its placement.
  *
@@ -131,6 +140,7 @@ public SharedPlugin __pl_Couch =
 		MarkNativeAsOptional("Couch_IsPlaced");
 		MarkNativeAsOptional("Couch_Spawn");
 		MarkNativeAsOptional("Couch_Bring");
+		MarkNativeAsOptional("Couch_Goto");
 		MarkNativeAsOptional("Couch_Remove");
 		MarkNativeAsOptional("Couch_IsEffectEnabled");
 		MarkNativeAsOptional("Couch_SetEffectEnabled");