Experimenting with some new ways to handle config

For now I’ve chucked it on Flarum\Core as a static method, but
ultimately I think we will need a ConfigRepository abstraction (whether
it replaces or sits underneath the Flarum\Core static method I’m not
sure).

Also starting to think about multisite scenarios, I think this is
important. The Forum model could actually end up with a database table
behind it, and each forum would have its own config settings? Haven’t
really thought about it too hard yet…

src/Core.php

@@ -1,9 +1,20 @@
 <?php namespace Flarum;
 
+use DB;
+
 class Core
 {
     public static function isInstalled()
     {
         return file_exists(base_path('../config.php'));
     }
+
+    public static function config($key, $default = null)
+    {
+        if (is_null($value = DB::table('config')->where('key', $key)->pluck('value'))) {
+            $value = $default;
+        }
+
+        return $value;
+    }
 }