create PlayerManager static class

src/engine/devcmd/cmds/InfoCmd.java

@@ -15,6 +15,7 @@ import engine.Enum.GameObjectType;
 import engine.Enum.TargetColor;
 import engine.devcmd.AbstractDevCmd;
 import engine.gameManager.BuildingManager;
+import engine.gameManager.PlayerManager;
 import engine.gameManager.SessionManager;
 import engine.math.Vector3fImmutable;
 import engine.objects.*;
@@ -335,7 +336,7 @@ public class InfoCmd extends AbstractDevCmd {
 
                 output += "Altitude : " + targetPC.getLoc().y;
 
-                output += "Swimming : " + targetPC.isSwimming();
+                output += "Swimming : " + PlayerManager.isSwimming(targetPC);
                 output += newline;
                 output += "isMoving : " + targetPC.isMoving();
                 output += newline;