refactor(sonar): more small fixes

- std::format instead of iostream manipulators in to_string/to_hex_str (cpp:S6495);
  output verified identical, negative hex values keep the unsigned form
- remove an empty compound statement (cpp:S108)
- drop an always-false unsigned < 0 branch (cpp:S1768)
- explicit lambda capture (cpp:S3608)
- std::make_unique (cpp:S5950)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

application/driverhints.cpp

@@ -38,7 +38,7 @@ void
 TController::remove_hint( driver_hint const Value ) {
 
     m_hints.remove_if(
-        [=]( auto const &Hint ) {
+        [Value]( auto const &Hint ) {
             return std::get<driver_hint>(Hint) == Value; } );
 }
 

rendering/nullrenderer.cpp

@@ -3,7 +3,7 @@
 
 std::unique_ptr<gfx_renderer> null_renderer::create_func()
 {
-    return std::unique_ptr<null_renderer>(new null_renderer());
+    return std::make_unique<null_renderer>();
 }
 
 bool null_renderer::renderer_register = gfx_renderer_factory::get_instance()->register_backend("null", null_renderer::create_func);

simulation/simulationtime.cpp

@@ -167,7 +167,7 @@ scenario_time::daymonth( WORD &Day, WORD &Month, WORD const Year, WORD const Yea
 int
 scenario_time::julian_day() const {
 
-    int yy = static_cast<int>(( m_time.wYear < 0 ? m_time.wYear + 1 : m_time.wYear ) - std::floor( ( 12 - m_time.wMonth ) / 10.f ));
+    int yy = static_cast<int>( m_time.wYear - std::floor( ( 12 - m_time.wMonth ) / 10.f ));
     int mm = m_time.wMonth + 9;
     if( mm >= 12 ) { mm -= 12; }
 

utilities/utilities.cpp

@@ -249,23 +249,18 @@ std::string to_string(int Value, int width)
 
 std::string to_string(double Value, int precision)
 {
-	std::ostringstream o;
-	o << std::fixed << std::setprecision(precision) << Value;
-	return std::move(o).str();
+	return std::format("{:.{}f}", Value, precision);
 };
 
 std::string to_string(double const Value, int const Precision, int const Width)
 {
-	std::ostringstream o;
-	o << std::setw(Width) << std::fixed << std::setprecision(Precision) << Value;
-	return std::move(o).str();
+	return std::format("{:>{}.{}f}", Value, Width, Precision);
 };
 
 std::string to_hex_str(int const Value, int const Width)
 {
-	std::ostringstream o;
-	o << "0x" << std::uppercase << std::setfill('0') << std::setw(Width) << std::hex << Value;
-	return o.str();
+	// iostreams print negative values in hex as their unsigned representation
+	return std::format("0x{:0{}X}", static_cast<unsigned int>(Value), Width);
 };
 
 std::string const fractionlabels[] = {U8(" "), U8("¹"), U8("²"), U8("³"), U8("⁴"), U8("⁵"), U8("⁶"), U8("⁷"), U8("⁸"), U8("⁹")};

vehicle/Train.cpp

@@ -10033,8 +10033,6 @@ void TTrain::update_sounds(double const Deltatime)
 #ifdef _WIN32
 			Console::BitsClear(1 << 14); // ustawienie bitu 16 na PoKeys
 #endif
-		}
-
 		}
 
 		if (dsbBuzzerShp && dsbBuzzerShp->is_playing())