keep timespeed after f6, add fpslimit

Globals.h

@@ -81,6 +81,7 @@ struct global_settings {
     double fMoveLight{ -1 }; // numer dnia w roku albo -1
     bool FakeLight{ false }; // toggle between fixed and dynamic daylight
     double fTimeSpeed{ 1.0 }; // przyspieszenie czasu, zmienna do testów
+	double default_timespeed { 1.0 }; // timescale loaded from config
     double fLatitudeDeg{ 52.0 }; // szerokość geograficzna
     float ScenarioTimeOverride { std::numeric_limits<float>::quiet_NaN() }; // requested scenario start time
     float ScenarioTimeOffset { 0.f }; // time shift (in hours) applied to train timetables
@@ -177,6 +178,8 @@ struct global_settings {
 	bool dds_upper_origin = false;
     bool captureonstart = true;
 
+	std::chrono::duration<float> minframetime {0.0f};
+
 	bool python_mipmaps = true;
 	bool python_displaywindows = false;
 	bool python_threadedupload = true;