Added template_from_string() twig function

CHANGELOG.md

@@ -5,6 +5,7 @@
     * Added `Flex Pages` to Grav core and removed Flex Objects plugin dependency
     * Added `Utils::simpleTemplate()` method for very simple variable templating
     * Added `array_diff()` twig function
+    * Added `template_from_string()` twig function
 1. [](#improved)
     * Improved `Flex Users`: obey blueprints and allow Flex to be used in admin only
     * Improved `Flex` to support custom site template paths

system/src/Grav/Common/Twig/Twig.php

@@ -23,6 +23,7 @@ use Twig\Environment;
 use Twig\Error\LoaderError;
 use Twig\Extension\CoreExtension;
 use Twig\Extension\DebugExtension;
+use Twig\Extension\StringLoaderExtension;
 use Twig\Loader\ArrayLoader;
 use Twig\Loader\ChainLoader;
 use Twig\Loader\FilesystemLoader;
@@ -198,6 +199,7 @@ class Twig
             }
             $this->twig->addExtension(new TwigExtension());
             $this->twig->addExtension(new DeferredExtension());
+            $this->twig->addExtension(new StringLoaderExtension());
 
             $this->profile = new \Twig\Profiler\Profile();
             $this->twig->addExtension(new \Twig\Extension\ProfilerExtension($this->profile));