Feature/simple spinning (#1728)

* Define discrete rotation animation
* New class FontAwesome5Spinner extending FontAwesome5IconView, animated
* New class AutoAnimator to play Animation on a Node conditionally
* Replace all occurences of Progress Indicator with FontAwesome5Spinner
* Spin spinner icon in processing vault state
* remove undocumented progress indicator styling

src/main/resources/fxml/quit.fxml

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <?import org.cryptomator.ui.controls.FontAwesome5IconView?>
+<?import org.cryptomator.ui.controls.FontAwesome5Spinner?>
 <?import javafx.geometry.Insets?>
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.control.ButtonBar?>
 <?import javafx.scene.control.Label?>
-<?import javafx.scene.control.ProgressIndicator?>
 <?import javafx.scene.layout.HBox?>
 <?import javafx.scene.layout.StackPane?>
 <?import javafx.scene.layout.VBox?>
@@ -35,7 +35,7 @@
 					<Button text="%generic.button.cancel" ButtonBar.buttonData="CANCEL_CLOSE" defaultButton="true" cancelButton="true" onAction="#cancel"/>
 					<Button fx:id="lockAndQuitButton" text="%quit.lockAndQuit" ButtonBar.buttonData="FINISH" onAction="#lockAndQuit" contentDisplay="TEXT_ONLY">
 						<graphic>
-							<ProgressIndicator progress="-1" prefWidth="12" prefHeight="12"/>
+							<FontAwesome5Spinner glyphSize="12"/>
 						</graphic>
 					</Button>
 				</buttons>