Adding Bangle.getAppRect? Widget bar size...

Something like that would be very nice!
Some thoughts:

• Does it have to be a function? Could maybe just be Bangle.APP, as we already have Bangle.WIDGETS?
  
• When would it be allowed to change? I'm thinking only when calling Bangle.loadWidgets().
  
• x,y,w,h looks nice, but if something is called *Rect I would expect x1,y1,x2,y2, like g.fillRect().
  

• Also: x,y,w,h feels neater, but will make apps calculate a lot of x+w-1, whereas x2 wouldn't have the off-by-one problems, from the above example:

  var dim = Bangle.getAppRect();
  g.clearRect(dim.x, dim.y, dim.w, dim.h); // wrong
  g.clearRect(dim.x, dim.y, dim.w, dim.h + dim.y); // also wrong :-(
  g.clearRect(dim.x, dim.y, dim.x + dim.w - 1, dim.h + dim.y -1 ); // correct
  // vs
  g.clearRect(dim.x1, dim.y1, dim.x2, dim.y2);
  

  Same goes for

  var app = Bangle.getAppRect();
  g.setFontAlign(1, 1); // right,bottom
  g.drawString('bottom right', app.x+app.w-1, app.y+app.h-1);
  // vs
  g.drawString('bottom right', app.x2, app.y2);