Calculator button sizing

The current calculator setup has a lot of options which is a god thing, however most of the time we need a calculator we don't need more than the simple functions and a 'larger on-screen' calculator.

I think it would be a great idea that the pro function should be a toggle option but the default to be an on screen calculator with big buttons and basic functions.

Converters are also something that would be helpful, but that is another thing.