Add train length and group name to vehicle details window.

Add settings to control each, default on.
Re-init window whenever presence of group name line changes.

src/table/settings.ini

@@ -3133,6 +3133,24 @@ strhelp  = STR_CONFIG_SETTING_GRAPH_LINE_THICKNESS_HELPTEXT
 strval   = STR_JUST_COMMA
 proc     = RedrawScreen
 
+[SDTC_BOOL]
+var      = gui.show_train_length_in_details
+flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
+def      = true
+str      = STR_CONFIG_SETTING_SHOW_TRAIN_LENGTH_IN_DETAILS
+strhelp  = STR_CONFIG_SETTING_SHOW_TRAIN_LENGTH_IN_DETAILS_HELPTEXT
+proc     = RedrawScreen
+cat      = SC_BASIC
+
+[SDTC_BOOL]
+var      = gui.show_vehicle_group_in_details
+flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
+def      = true
+str      = STR_CONFIG_SETTING_SHOW_VEHICLE_GROUP_IN_DETAILS
+strhelp  = STR_CONFIG_SETTING_SHOW_VEHICLE_GROUP_IN_DETAILS_HELPTEXT
+proc     = RedrawScreen
+cat      = SC_BASIC
+
 ; For the dedicated build we'll enable dates in logs by default.
 [SDTC_BOOL]
 ifdef    = DEDICATED