Feature/plugins versions check (#310)

* Check plugins versions from plugins.my-aac.org/api

* Improve plugin update check messaging

Updated the success message when checking for plugin updates to clarify the source. Added an informational message when outdated plugins are found to improve user feedback.

* Use configurable API URI for plugin updates

Replaces hardcoded plugin API URI with a configurable value from config, defaulting to the official API. Also fixes a typo in the success message.

system/templates/admin.plugins.form.html.twig

@@ -1,7 +1,9 @@
 <div id="install_plugin">
 	<div class="card card-info card-outline">
 		<div class="card-header">
-			<h5 class="m-0">Install plugin</h5>
+			<h5 class="m-0">Install plugin
+				<a href="?p=plugins&check-updates" class="btn btn-primary float-right">Check for updates</a>
+			</h5>
 		</div>
 		<form enctype="multipart/form-data" method="post" action="{{ constant('ADMIN_URL') }}?p=plugins">
 			{{ csrf() }}

system/templates/admin.plugins.outdated.html.twig

@@ -0,0 +1,18 @@
+<table class="table table-bordered table-striped">
+	<thead>
+	<tr>
+		<th>Plugin Name</th>
+		<th>Your Version</th>
+		<th>Latest Version</th>
+		<th>Download link</th>
+	</tr>
+	</thead>
+	{% for plugin in plugins %}
+		<tr>
+			<td>{{ plugin.name }}</td>
+			<td>{{ plugin.yourVersion }}</td>
+			<td>{{ plugin.latestVersion }}</td>
+			<td><a href="{{ plugin.download_link }}" target="_blank">{{ plugin.download_link }}</a></td>
+		</tr>
+	{% endfor %}
+</table>