entity: synchronize ticking

Now we can not tick multiple times at the same time (this caused lag for the camera entity)

src/main/java/de/bixilon/minosoft/data/entities/entities/Entity.kt

@@ -206,6 +206,7 @@ abstract class Entity(
         lastTickTime = time
     }
 
+    @Synchronized
     fun tryTick(): Boolean {
         val time = millis()