Many new things

src/main/java/org/openautonomousconnection/luascript/fx/FxClipboardHost.java

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+package org.openautonomousconnection.luascript.fx;
+
+import javafx.application.Platform;
+import javafx.scene.input.Clipboard;
+import javafx.scene.input.ClipboardContent;
+import org.openautonomousconnection.luascript.hosts.ClipboardHost;
+
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * JavaFX clipboard host (text only).
+ */
+public final class FxClipboardHost implements ClipboardHost {
+
+    @Override
+    public void setText(String text) {
+        String s = text == null ? "" : text;
+        Platform.runLater(() -> {
+            ClipboardContent c = new ClipboardContent();
+            c.putString(s);
+            Clipboard.getSystemClipboard().setContent(c);
+        });
+    }
+
+    @Override
+    public String getText() {
+        AtomicReference<String> out = new AtomicReference<>("");
+        FxThreadBridge.runAndWait(() -> {
+            String s = Clipboard.getSystemClipboard().getString();
+            out.set(s == null ? "" : s);
+        });
+        return out.get();
+    }
+}