Install psalm as dev, sync scripts updates

vendor/felixfbecker/language-server-protocol/src/FailureHandlingKind.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+/**
+ * Defines how the host (editor) should sync document changes to the language server.
+ */
+abstract class FailureHandlingKind
+{
+    /**
+     * Applying the workspace change is simply aborted if one of the changes
+     * provided fails. All operations executed before the failing operation
+     * stay executed.
+     */
+    const ABORT = 'abort';
+
+    /**
+     * All operations are executed transactional. That means they either all
+     * succeed or no changes at all are applied to the workspace.
+     */
+    const TRANSACTIONAL = 'transactional';
+
+
+    /**
+     * If the workspace edit contains only textual file changes they are
+     * executed transactional. If resource changes (create, rename or delete
+     * file) are part of the change the failure handling strategy is abort.
+     */
+    const TEXT_ONLY_TRANSACTIONAL = 'textOnlyTransactional';
+
+    /**
+     * The client tries to undo the operations already executed. But there is no
+     * guarantee that this is succeeding.
+     */
+    const UNDO = 'undo';
+}