jeffro256 332d92ffbe
epee: span::operator[] allow mut ref from const span
Changes the `operator[]` method so we can get mutable
references to elements even if the span is `const`.
The operator is now also `constexpr`.
This behavior matches `std::span`.

C++ standard reference: https://en.cppreference.com/w/cpp/container/span/operator_at
2025-03-22 16:53:17 -05:00
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