OpenCalc - Calculator

Invalid date

New:
- Use BigDecimal instead of Double
- Setting to convert results to scientific notation
- Add an option to use modulo
- Add an option to select a value instead of copying it
- Add an option to split the parentheses button
- Add an option to disable history
- Add license to about section

Improvements:
- Optimize the calculator
- Replace not essential EditText by TextView
- Enable symbol before decimal
- Scale up the back button hitbox
- Update several translations

Fixes:
- Several fixes...