onRemove will be executed when removing file button is clicked, remove event will be prevented when return value is false.
But, if we want't to popup a confirm dialog, it can't block the execution of onRemove.
So, I add Promise support for onRemove. The return value of onRemove now can be a Promise, and the handleRemove function in Upload can wait for the non-blocking confirm dialog.
* Unify name of ReactNode type in document
* Lowser all string type name
* Lowercase all number type name
* Lowercase all boolean type name
* Unify array type
* Lowercase all object type name
* Unify mutilple types
* support prevent removing when return value is false, close#4456
* Add showRemoveIcon & showPreviewIcon into showUploadList
close#4384 & #4351
* fix typo
