message: [terminal] Adding a concept requirement to applySGR().
diff: #include <sstream>
  #include <string_view>
  #include <tuple>
  +#include <type_traits>
  #include <variant>
  using namespace std::string_view_literals;
  @@ -2565,6 +2566,7 @@ namespace impl
  }
  template <typename Target>
  + CRISPY_REQUIRES((CellConcept<Target> || std::is_same_v<Target, Terminal>) )
  ApplyResult applySGR(Target& target, Sequence const& seq, size_t parameterStart, size_t parameterEnd)
  {
  if (parameterStart == parameterEnd)
  