Use keyval for package options

[u-fischer]

Status

READY

Description

• changes the package option to the new keyval-handler to avoid option clash errors.
• removed the euenc code
• made the euenc and tuenc option obsolete.

Todos

• Tests added to cover new/fixed functionality
• Documentation if necessary
• Code follows expl3 style guidelines

Minimal example demonstrating the new/fixed functionality

\documentclass{article}
\usepackage{fontspec}
\usepackage[no-math]{fontspec}
\begin{document}
hello $\mathrm{a}$ 
\end{document}

[davidcarlisle]

PR looks good but tests are failing in gh