Add: company mode enforcement checks to functions with command or company access

Command functions are those that call ScriptObject::Command, and functions
with company access are any that call ScriptObject::GetCompany. This is a bit
over-protective, but having the check everywhere makes it easier to validate
that no check is missing automatically instead of by review.

src/script/api/script_station.cpp

@@ -238,6 +238,7 @@ template<bool Tfrom, bool Tvia>
 
 /* static */ bool ScriptStation::OpenCloseAirport(StationID station_id)
 {
+	EnforceCompanyModeValid(false);
 	EnforcePrecondition(false, IsValidStation(station_id));
 	EnforcePrecondition(false, HasStationType(station_id, STATION_AIRPORT));