[WIP] Implemented basic permissions (#960)

* Add permissions to Database & add "User"-classes

* Add UI & API for Permissions, protect "User"-(Api)-Controller with new permissions.

* Add some permissions.

* Add permission localization

* Add error handling.

* Error pages: only redirect on 404

* ExceptionController: return JSON-Response on api-routes

* Rename PRODUCT_ADD to PRODUCT_PURCHASE

* Move translation to new file

* Fix checkboxes stay selected on reload.

* Remove configurable User-implementation

* Remove MASTER_DATA_READ

* Disable buttons the user isn't allowed to use.

* Add default permissions for new users

* When migration to permissions, everyone starts as ADMIN

* Permission-Localization: add to transifex & LocalizationService

* Review

Co-authored-by: Bernd Bestel <bernd@berrnd.de>

views/userpermissions.blade.php

@@ -0,0 +1,34 @@
+@extends('layout.default')
+
+@section('title', $__t('Permissions for user %s', GetUserDisplayName($user)))
+@section('activeNav', '')
+@section('viewJsName', 'userpermissions')
+
+@push('pageScripts')
+    <script>
+        Grocy.EditObjectId = {{ $user->id }};
+    </script>
+@endpush
+
+@section('content')
+<div class="row">
+	<div class="col">
+		<h2 class="title">@yield('title')</h2>
+	</div>
+</div>
+<hr>
+<div class="row mt-3">
+	<div class="col">
+		<ul>
+            @foreach($permissions as $perm)
+                <li>
+                    @include('components.userpermission_select', array(
+                        'permission' =>  $perm
+                        ))
+                </li>
+            @endforeach
+        </ul>
+        <button id="permission-save" class="btn btn-success" type="submit">{{ $__t('Save') }}</button>
+	</div>
+</div>
+@endsection