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

application/scenarioloadermode.cpp

@@ -21,6 +21,8 @@ http://mozilla.org/MPL/2.0/.
 #include "utilities/translation.h"
 #include "audio/audiorenderer.h"
 
+#include <format>
+
 scenarioloader_mode::scenarioloader_mode() {
     m_userinterface = std::make_shared<scenarioloader_ui>();
 }
@@ -52,8 +54,9 @@ bool scenarioloader_mode::update() {
 		try {
 			state = simulation::State.deserialize_begin(Global.SceneryFile);
 		}
-		catch (std::exception const &e) {
-			ErrorLog("Bad init: scenario \"" + Global.SceneryFile + "\" couldn't be opened (" + e.what() + ")");
+		// the file it can't read, as the parser and the scenery opening it report it
+		catch (std::runtime_error const &e) {
+			ErrorLog(std::format("Bad init: scenario \"{}\" couldn't be opened ({})", Global.SceneryFile, e.what()));
 			state.reset();
 			Global.SceneryFile.clear();
 			Application.pop_mode();