Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/vendor/psr/event-dispatcher/src/EventDispatcherInterface.php

@@ -1,21 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Psr\EventDispatcher;
-
-/**
- * Defines a dispatcher for events.
- */
-interface EventDispatcherInterface
-{
-    /**
-     * Provide all relevant listeners with an event to process.
-     *
-     * @param object $event
-     *   The object to process.
-     *
-     * @return object
-     *   The Event that was passed, now modified by listeners.
-     */
-    public function dispatch(object $event);
-}

docker/streamline-src/vendor/psr/event-dispatcher/src/ListenerProviderInterface.php

@@ -1,19 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Psr\EventDispatcher;
-
-/**
- * Mapper from an event to the listeners that are applicable to that event.
- */
-interface ListenerProviderInterface
-{
-    /**
-     * @param object $event
-     *   An event for which to return the relevant listeners.
-     * @return iterable[callable]
-     *   An iterable (array, iterator, or generator) of callables.  Each
-     *   callable MUST be type-compatible with $event.
-     */
-    public function getListenersForEvent(object $event) : iterable;
-}

docker/streamline-src/vendor/psr/event-dispatcher/src/StoppableEventInterface.php

@@ -1,26 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Psr\EventDispatcher;
-
-/**
- * An Event whose processing may be interrupted when the event has been handled.
- *
- * A Dispatcher implementation MUST check to determine if an Event
- * is marked as stopped after each listener is called.  If it is then it should
- * return immediately without calling any further Listeners.
- */
-interface StoppableEventInterface
-{
-    /**
-     * Is propagation stopped?
-     *
-     * This will typically only be used by the Dispatcher to determine if the
-     * previous listener halted propagation.
-     *
-     * @return bool
-     *   True if the Event is complete and no further listeners should be called.
-     *   False to continue calling listeners.
-     */
-    public function isPropagationStopped() : bool;
-}