Split the importer module out from the installer module (#468)

* Split the importer module out from the installer module

* Cleanup of unused imports

* Move updater into separate module #453

* Remove unused imports/formatting

* Disable the install and importer modules at the end of the setup

* Unused imports; update IJ style

* test explicit stage for php+mysql

* add more to matrix

* Add different MariaDB versions

* undo

modules/Importer/Resources/views/error.blade.php

@@ -0,0 +1,9 @@
+@extends('importer::app')
+@section('title', 'Import Error!')
+
+@section('content')
+  <div style="align-content: center;">
+    <h4>Error!</h4>
+    <p class="text-danger">{{ $error }}</p>
+  </div>
+@endsection