Add implementation of multi-aspect signalling and GRF support

Requires realistic braking

See: #247

src/saveload/afterload.cpp

@@ -3976,6 +3976,8 @@ bool AfterLoadGame()
 	extern void YapfCheckRailSignalPenalties();
 	YapfCheckRailSignalPenalties();
 
+	UpdateExtraAspectsVariable();
+
 	if (_networking && !_network_server) {
 		SlProcessVENC();
 	}
@@ -4050,6 +4052,8 @@ void ReloadNewGRFData()
 		}
 	}
 
+	UpdateExtraAspectsVariable();
+
 	/* Update company statistics. */
 	AfterLoadCompanyStats();
 	/* Check and update house and town values */