MAPG-164 show application's name from env variable

views/templates/footer.php

@@ -1,5 +1,5 @@
 </main>
 <footer>
-    <p><span class="bold">MapGuesser</span> <?= VERSION ?></p><!--
+    <p><span class="bold"><?= $_ENV['APP_NAME'] ?></span> <?= VERSION ?></p><!--
  --><p>&copy; Pőcze Bence <?= (new DateTime(REVISION_DATE))->format('Y') ?></p>
 </footer>

views/templates/header.php

@@ -1,8 +1,8 @@
 <header>
     <h1>
-        <a href="/" title="MapGuesser">
+        <a href="/" title="<?= $_ENV['APP_NAME'] ?>">
             <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>"><!--
-         --><span>MapGuesser</span>
+         --><span><?= $_ENV['APP_NAME'] ?></span>
         </a>
     </h1>
     <p>

views/templates/main_header.php

@@ -3,7 +3,7 @@
 <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
-    <title>MapGuesser</title>
+    <title><?= $_ENV['APP_NAME'] ?></title>
     <link href="<?= $_ENV['STATIC_ROOT'] ?>/css/mapguesser.css?rev=<?= REVISION ?>" rel="stylesheet">
     <?php if (isset($cssFiles)) : ?>
         <?php foreach ($cssFiles as $cssFile) : ?>