Creating a single app that supports Bangle.js 1 and 2

Good idea, but to be clear this is about the app loader view from the user perspective. It still allows for seperate versions of the code in the src/app directory.

Creating a single App that supports all Bangle Js devices ideally means a single source file. That means..

• conditional code based on hw version
  
• using the layout manager
  
• using tricks like g.setFont('Vector', g.getWidth()/8)