* <add>(create-api): $updateProps + (picker): watch selectIndex

* <delete> immediate

2. 在数据 dirty 情况下通过 refresh 和 destroy 来更新 wheels, 替代全部重新 create 方案

2. 列数减少时，去除多余的 pickerSelectedVal 和 pickerSelectedIndex

2. 过滤多余的 pickerSelectedVal

1. 列数增加: 增加的列对应的 scroll 未实例化无法滚动
2. 列数减少: pickerSelectedVal 保留了变化前选中的值

* <add>(picker): swipeTime

* <update>(doc): pickers

* <add>(picker): alias

* <update>(picker.doc): alias

* <update>(picker.doc): english alias

* <update>(picker.doc): alias and createDialog

* <add>(cascade-picker): alias

* <update>(cascade-picker): createDialog

* <update>(cascade-picker): alias

* <add>(picker.test + cascade-picker.test): alias

* CascadePicker init

* add tests