Handy Calculator

2.5: Updated to target Android API 36.
2.4: Added an option to the menu to generate a table of values, useful for building work.
2.3: Fixed a bug with the Enter button in RPN mode.
2.2: Fixed a bug which was preventing the digits from displaying for some languages.
2.1: Updated to target Android SDK 35.
1.8: Improvements to RPN mode.
1.7: Added a Reverse Polish Notation (RPN) mode which can be selected on the settings page.
1.6: Allow entry of numbers starting with a leading decimal point.