Refactor / rewrite Upload_ReactComponent.react.js

[fohrloop]

The Upload_ReactComponent.react.js would really need some refactoring. This would make further development a lot easier and the package more maintainable.

[sorenwacker]

I would like to help, but I have no idea where to start. Is there a description on how to setup the development environment?

[fohrloop]

I'm very happy to hear! You can read the instructions for setting the development environment in the CONTRIBUTING.md. Please just let me know if you need any other guidance.

[Vipulsh]

Is this still being worked on? If not I would like to pick it up.

[fohrloop]

I have not done anything for this but I don't know if @soerendip has. Great to hear @Vipulsh if you want to help!

[Vipulsh]

Alright, I will set up the dev environment first and then start working on it.

[Vipulsh]

I have created a pull request after making some changes.

[fohrloop]

Great! Thank you @Vipulsh, I will have a look and do some testing once I have some time :)

[fohrloop]

There has been some new merges (e.g. #26), and the most up-to-date refactored branch is the v.0.5.0 release candidate: https://github.com/np-8/dash-uploader/tree/0.5.0

Some more refactoring could still be done. It might be useful to refactor with #21.