show file download indicator when downloading space

[juancarlosfarah]

Currently we show a loading div when downloading a space. It would be great to have a loading bar that advances as the number of files that need to be downloaded are downloaded.

A simple first version could keep the loading div and a counter below:

Downloading file XX / XX...

In order to achieve this, we need to have a channel that sends info from the Electron process to the React front end. The information could then be kept in the space reducer under the current object, or in a new "Download" reducer, with its own objects "current" and "all" or something like that.