added realistic visual effects to the game

- imported the jme3-effects library
- edited SeaSynchronizer to handle different effects
- added to the ShipControl class in the controlUpdate(float tpf) method the handler that moves a destroyed ship downward

Projekte/battleship/client/build.gradle

@@ -9,11 +9,13 @@ implementation project(":jme-common")
     implementation project(":battleship:model")
 
     implementation libs.jme3.desktop
+    implementation libs.jme3.effects
 
     runtimeOnly libs.jme3.awt.dialogs
     runtimeOnly libs.jme3.plugins
     runtimeOnly libs.jme3.jogg
     runtimeOnly libs.jme3.testdata
+
 }
 
 application {