Functions for converting from and to UTF8

[numeredev]

DESCRIPTION

What does your feature request improve on? Please describe. NumeRe only supports ANSI as encoding (CP1252, in fact). It would be helpful, if there would be functions for converting to and from UTF8 (as far as possible).

Describe the solution you'd like Create two string functions for converting to and from UTF8, i.e. utf8toansi() and ansitoutf8() or similar.

Additional context Add any other context or screenshots about the feature request here.

(Do not write below this line)

---

DEVS' SECTION

ANALYSIS

• The function from UTF-8 to CP1252 is already available as std::string utf8parser(const std::string& sString) in stringtools.cpp, the corresponding counterpart has to be added (is available in some other code bases).
• Create the necessary wrapper function as string functions in stringfunctions.hpp and register them correspondingly.
• Add both functions to the language files

IMPLEMENTATION STEPS

(see also our Wiki for implementation guidelines)

• Implement the necessary changes in a new branch created here on GitHub
• Test your implementation

DOCUMENTATION STEPS

(see also our Wiki for further information)

• Update the changes log
• Add comments to your implementation
• Add Doxygen documentation comments
• Create or update the documentation articles (*.NHLP and *.NDB files, if needed)
• Update the language strings (*.NLNG files, if needed)

PULL REQUEST

• Create a pull request for your changes
• Fill out the template
• Assign @numere-org/maintainers as reviewers