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

launcher/scenery_scanner.cpp

@@ -2,6 +2,8 @@
 #include "scenery_scanner.h"
 #include "utilities/Logs.h"
 
+#include <system_error>
+
 scenery_scanner::scenery_scanner(ui::vehicles_bank &bank)
     : bank(bank)
 {
@@ -17,7 +19,8 @@ void scenery_scanner::scan()
 		try {
 			name = path.string();
 		}
-		catch (std::exception const &) {
+		catch (std::system_error const &) {
+			// a name outside of the code page, which the path can't give as a string on Windows
 			continue;
 		}