#169 - Add extra option to enable/disable fade out on eof

...main/java/de/tobias/playpad/pad/content/AudioContent.java

...viewcontroller/option/pad/PlayerPadTabViewController.java

...iewcontroller/option/profile/PlayerTabViewController.java

...s/playpad/viewcontroller/settings/FadeViewController.java

PlayWall/src/main/resources/lang/ui_de.properties

PlayWall/src/main/resources/view/settings/FadeView.fxml

...Core/src/main/java/de/tobias/playpad/pad/PadSettings.java

...ain/java/de/tobias/playpad/pad/PadSettingsSerializer.java

...llCore/src/main/java/de/tobias/playpad/pad/fade/Fade.java

...re/src/main/java/de/tobias/playpad/pad/fade/Fadeable.java

...as/playpad/pad/fade/listener/PadFadeDurationListener.java

.../main/java/de/tobias/playpad/profile/ProfileSettings.java

...rc/main/java/de/tobias/playpad/settings/FadeSettings.java