Refactoring

[hextriclosan]

In my opinion main.cpp is too bulky. I split it and made some polishing

[ArthurSonzogni]

Thanks!

This is something I wanted too. I am going probably to address those suggestions:

• Use Chromium coding style (function start with an upper case, use header guards, etc)
• Move json parsing out of the draw file.
• rename draw.cpp into something more like component or main_component. I am going to take a look.