Allow user activation/deactivation (MySQL auth) (#10511)

* user deactivation feature

* update db_schema.yaml

* travis fix

* readd sqlfile with alter statement

* ..

* revert force push

* combine all queries

* fix query

* user enable/disable only visible on mysql authorization

* Update form.blade.php

* Update index.blade.php

* disable 'enabled' on own profile

* bootstraping checkboxes

database/migrations/2019_08_10_223200_add_enabled_to_users.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+class AddEnabledToUsers extends Migration
+{
+
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->boolean('enabled')->default(1);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('enabled');
+        });
+    }
+}