v1.2.0-beta.1

• Fix many bugs
• New installation UI
• Improve dashboard UI on mobile platform
• Improve markdown editor & update markdown parser
• Improve backup performance
• New abastact layer for widget
• Improve database framework
• Reformat code for PHP 7.2 (now using namespace)
• Use new version rule (1.x/<year>.<month>.<day> => 1.x.<minor version>)
• For creating a widget
  Before

  $this->widget('Widget_Metas_Category_List');
  Typecho_Widget::widget('Widget_Metas_Category_List');

  After

  \Widget\Metas\Category\Rows::alloc();

  ⚠️ You can always use the old way to create a widget, but a migration is recommended.
• Improve API $options->adminStaticUrl()

  $options->adminStaticUrl('css', 'style.css'); // It will display a url with version(`<url>?v=<version>`)
                                                // no need to add it manually.
  
  $options->adminStaticUrl('css', 'style.css', ture); // Return a url instead of displaying it