added class ImpactEffectManager to implement the funktionality with hit or miss particles
added map4 for particle testing purposes
edited class SeaSynchronizer in order to implement the particle feature
edited class ShipControl in order to implement the particle feature
edited settings.gradle in order to implement the particle feature
added JavaDocs for the new and adapted functions
added a new invalid map for testing purposes
fixed implemented the logic to check for invalid maps in the method received in ServerGameLogic