*: multiple performance improvements like marking `static const` when it makes sense... date: change old stupid heap-based method to a structure which should make copying the thing actually make a copy. also many performance-based changes, like removing the std::tie dependency and forward-declaring nlohmann json *: replace every instance of QString::fromUtf8 to Strings::ToQString. the main difference is that our function will always convert exactly what is in the string, while some other times it would only convert up to the nearest NUL byte

#include "core/config.h"
#include "gui/translate/config.h"

namespace Translate {

Themes ToTheme(const std::string& theme) {
	const std::unordered_map<std::string, Themes> map = {
		{"Default", Themes::OS   },
		{"Light",   Themes::LIGHT},
		{"Dark",    Themes::DARK }
	};

	if (map.find(theme) == map.end())
		return Themes::OS;
	return map.at(theme);
}

std::string ToString(const Themes& theme) {
	switch (theme) {
		default:
		case Themes::OS:    return "Default";
		case Themes::LIGHT: return "Light";
		case Themes::DARK:  return "Dark";
	}
}

}