Week 2 GSoC with phpMyAdmin

Completed 2 weeks of Google Summer of Codes with phpMyAdmin. My main task for the first two weeks was to implement webpack and babel configuration and converting some functions which are globally available into modules which can be imported at times of need. I have changed some of the files with modular structure, now I need to work on making this new structure compatible with existing code.

Major task for this week is to convert the AJAX global object into a module with a global scope in the application so that its instance can be used in different modules and files and making some part of new structure compatible.

Apart from that raised solved one issue regarding Edit Variable in Variables page in this pr.