Plugin manager, misc fixes

* Fixed an error when trying to create nonexisting resource type
* Updated the init-command to create plugins and scipts directories
* Added a basic installer function

src/Commands/InitCommand.php

@@ -26,12 +26,14 @@ class InitCommand extends Command
 
         mkdir($configDir);
         mkdir($configDir."/plugins");
+        mkdir($configDir."/scripts");
         file_put_contents($configDir."/spark.json", json_encode([
             'preload' => [
-                './.spark/plugins/*'
+                './.spark/plugins/*',
+                './.spark/scripts/*'
             ],
             'scripts' => [
-                'hello' => "echo 'Hello World\n'"
+                'hello' => "echo 'Hello World'"
             ]
         ], JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));