Integrate Refactor solver sources and dual MSVC CMake builds

src/fesa/core/ascii.cpp

@@ -13,6 +13,15 @@ char AsciiLower(const char value) noexcept {
   return value;
 }
 
+std::string AsciiUppercase(std::string value) {
+  for (char& character : value) {
+    if (character >= 'a' && character <= 'z') {
+      character = static_cast<char>(character - 'a' + 'A');
+    }
+  }
+  return value;
+}
+
 bool AsciiCaseInsensitiveEquals(const std::string_view lhs,
                                 const std::string_view rhs) noexcept {
   if (lhs.size() != rhs.size()) {
@@ -35,14 +44,13 @@ Result<std::int64_t> ParsePositiveSourceLabel(const std::string_view text) {
   if (parsed.ec == std::errc{} && parsed.ptr == last && value > 0) {
     return Result<std::int64_t>::Success(value);
   }
-  const std::string identity{text};
   return Result<std::int64_t>::Failure(Status::Failure(
       FailureCategory::kInput,
       {{Severity::kError,
         "invalid-source-label",
         {{}, 0U},
         "SOURCE_LABEL",
-        identity,
+        std::string{text},
         "A source label must be a complete positive base-10 integer."}}));
 }