API to allow business author user to browse local data file and replace data table

Currently business user can use data canvas to browse local data file and replace data for selected data table.

It is appreciated similar API is also provided to allow template designer to use IronPython script to develop below template.

1. Template has a "Replace data" button in text area

2. Template is shared to business author user

3. Business author user open template in web player in editing mode;

   1. He clicks "Replace data" button

   2. Open file dialog of web browser shows and let user to select local data file

   3. Selected data file is transfered to web player server and data replcacement is performed for specific data table.