School scientific calculator 500 es plus 500 ms

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# 4.0.2
New unit converter design: now you can open unit converter from calculator or CONV dialog, and you can also transfer current expression to unit conversion calculator. With new button [ALL], the calculator supports convert to other units with single tap.
New settings: hide/show navigation bar, hide/show calculator toolbar. Button click volume setting in main screen.
Photo math: redesign scanner, improved AI.
[+-] button is replaced by percent button.

Thanks for all feedback from users.