Calculadora Mobi Calculator

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- added new themes and improved old ones!
- classic symbols × and ÷ instead of * and /, customizable via settings
- ability to change order of bottom buttons [0] [.] [%]
- returned main menu for history screen
- added integer division operator '\', just double tap [÷]
- PRO-version: removed "Mobi Calculator" signature at the bottom of shared calculations
- added Polish and Italian languages
- a lot of other small improvements and fixes