* precisely calculates the number of digits of the source and compute the number of significant digits of the result based on that.
* fix unit test
* Fix warning C4267
* Optimize how we calculate the number of digits in the integer part and don't trim the value when used by the currency converter
* modify GetNumberSignificantDigits
* fix CI error
* Access to wstring::npos from static calls
* Move UnitConverter static methods related to number to NumberFormattingUtils
* rename namespace
* Add comment and fix typo
* Move standard headers
