Rework StandardCalculator for operator precedence
Rework StandardCalculator for operator precedence

That works but there are three failing tests so some of the
other details are no longer correct.

corpuscle/corpuscle.github.io,webOS-ports/org.webosports.app.calculator,corpuscle/org.webosports.app.calculator,corpuscle/org.webosports.app.calculator,webOS-ports/org.webosports.app.calculator,webOS-ports/org.webosports.app.calculator,corpuscle/org.webosports.app.calculator,corpuscle/corpuscle.github.io,corpuscle/org.webosports.app.calculator,webOS-ports/org.webosports.app.calculator,corpuscle/corpuscle.github.io,corpuscle/corpuscle.github.io