Create 45.txt

fastlane/metadata/android/en-US/changelogs/45.txt

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+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:
+- Cursor location
+- Theme apply issue with amoled mode
+- Decimal factorial result
+- Landscape mode hides some button icons
+- Gray rectangle next to Settings
+- Formating issues
+- Many other fixes...