refactor: the Sonar remarks on the small fixes taken care of

- the log stops through a flag kept in a function, not a global one
- the messages are put together with std::format
- a vehicle dropped on a trainset in the launcher goes in once the
  trainset is drawn, so the vehicles are gone through with a plain loop
  again; the drop split into a new vehicle and a moved one
- the scenario that can't be opened is caught as the runtime error it
  is, a file name outside of the code page as the system error it is
- a track of an unknown type is left out through the pointer owning it
- the keyword of a track type written out by a function of its own
- the picked node forgotten with ranges::replace_if, the empty
  Forget_Node of the base renderer told why it is empty
- FileCased takes the path it works on

utilities/utilities.cpp

@@ -471,23 +471,22 @@ bool FileExists(std::string const &Filename)
 	return std::filesystem::exists(Filename);
 }
 
-std::string FileCased(std::string const &Filename)
+std::string FileCased(std::filesystem::path const &Filename)
 {
 	std::error_code error;
 	if (std::filesystem::exists(Filename, error))
-		return Filename;
+		return Filename.string();
 #ifdef _WIN32
 	// the names there are found in any case already: no folder to go through for every file missing, nor names outside of the
 	// code page to throw on
 	return {};
 #else
 	// only the name of the file itself, a folder named in another case isn't found
-	std::filesystem::path const path{Filename};
-	auto const directory{path.has_parent_path() ? path.parent_path() : std::filesystem::path{"."}};
-	auto const wanted{ToLower(path.filename().string())};
+	auto const directory{Filename.has_parent_path() ? Filename.parent_path() : std::filesystem::path{"."}};
+	auto const wanted{ToLower(Filename.filename().string())};
 	for (std::filesystem::directory_iterator entry{directory, error}, end; entry != end; entry.increment(error))
 		if (ToLower(entry->path().filename().string()) == wanted)
-			return path.has_parent_path() ? (directory / entry->path().filename()).string() : entry->path().filename().string();
+			return Filename.has_parent_path() ? (directory / entry->path().filename()).string() : entry->path().filename().string();
 	return {};
 #endif
 }