RubikCalc Ultra Calculator

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New Features
* Most Recent Functions
* Adding unit converters

Bugs
* Fix steps (steps are not being evaluated properly)
* Fixing some non-working functions
* Solving bugs in negative numbers calculation

Enhancements
* Enhance UI of custom inputs.
* Enhance Number pad
* Allow categorization in the functions list.
* Enhance UI in function list
* Enhancing User Input Method