Replace javafx duration with java.time

src/main/scala/de/tobias/playpad/server/json/DurationSerializerHandler.scala

 package de.tobias.playpad.server.json
 
+import java.time.Duration
+
 import com.google.gson.{JsonElement, JsonPrimitive}
-import javafx.util.Duration
 
 class DurationSerializerHandler extends SerializerHandler {
 	override def serialize(value: Any): JsonPrimitive = value match {
@@ -10,7 +11,7 @@ class DurationSerializerHandler extends SerializerHandler {
 	}
 
 	override def deserialize(jsonElement: JsonElement): Duration = jsonElement match {
-		case jsonPrimitive: JsonPrimitive => new Duration(jsonPrimitive.getAsInt)
+		case jsonPrimitive: JsonPrimitive => Duration.ofMillis(jsonPrimitive.getAsInt)
 		case _ => Duration.ZERO
 	}
 }

src/main/scala/de/tobias/playpad/server/project/settings/Fade.scala

 package de.tobias.playpad.server.project.settings
 
+import java.time.Duration
 import java.util.UUID
 
 import de.tobias.playpad.server.json._
-import javafx.util.Duration
 
 class Fade {
 

src/main/scala/de/tobias/playpad/server/project/settings/PadSettings.scala

 package de.tobias.playpad.server.project.settings
 
+import java.time.Duration
 import java.util.UUID
 
 import de.tobias.playpad.server.json._
 import de.tobias.playpad.server.project.{Design, Pad}
-import javafx.util.Duration
 
 class PadSettings {