Add company setting to auto-enable auto timetables for new vehicles.

Default: off.

src/table/company_settings.ini

@@ -134,6 +134,14 @@ strhelp  = STR_CONFIG_SETTING_SERVINT_AIRCRAFT_HELPTEXT
 strval   = STR_CONFIG_SETTING_SERVINT_VALUE
 proc     = UpdateIntervalAircraft
 
+[SDT_BOOL]
+base     = CompanySettings
+var      = vehicle.auto_timetable_by_default
+guiflags = SGF_PER_COMPANY
+def      = false
+str      = STR_CONFIG_SETTING_AUTO_TIMETABLE_BY_DEFAULT
+strhelp  = STR_CONFIG_SETTING_AUTO_TIMETABLE_BY_DEFAULT_HELPTEXT
+
 [SDT_END]