v1.7.2: Merge pull request #3566 from z-song/analysis-z9pwwP

Model form
  - Fixed file preview issue with uploaded files
  - Support for generating thumbnails while uploading images in form
  - Add $form->file('name')->downloadable() method

Model table
  - Add $grid->column('name')->downloadable() method
  - Add $grid->column('name')->color($color) method
  - Add $grid->column('name')->icon($icons = []) method
  - Add $grid->column('name')->replace($replacements = []) method
  - Optimize $grid->column('name')->label() and $grid->columnI('name')->badge() methods
  - Add $grid->column('name')->filter() method to implements column filtering
  - Add $grid->column('name')->copyable() method
  - Add $grid->column('name')->qrcode() method
  - Implement shortcuts for grid pages

模型表单

• 修复上传文件组建的文件预览问题
• 支持form表单上传图片的同时生成缩略图
• 增加了$form->file('name')->downloadable()方法

模型表格

• 增加$grid->column('name')->downloadable()方法
• 增加$grid->column('name')->color($color)方法
• 增加$grid->column('name')->icon($icons = [])方法
• 增加$grid->column('name')->replace($replacements = [])方法
• 优化$grid->column('name')->label()和$grid->columnI('name')->badge()方法
• 增加$grid->column('name')->filter()方法，实现列过滤
• 增加$grid->column('name')->copyable()方法
• 增加$grid->column('name')->qrcode()方法
• 实现grid页面的快捷键