Add PF setting for whether to pathfind up to back of one-way PBS

src/lang/english.txt

@@ -1275,6 +1275,8 @@ STR_CONFIG_SETTING_ROAD_VEHICLE_SLOPE_STEEPNESS                 :Slope steepness
 STR_CONFIG_SETTING_ROAD_VEHICLE_SLOPE_STEEPNESS_HELPTEXT        :Steepness of a sloped tile for a road vehicle. Higher values make it more difficult to climb a hill
 STR_CONFIG_SETTING_FORBID_90_DEG                                :Forbid trains from making 90° turns: {STRING2}
 STR_CONFIG_SETTING_FORBID_90_DEG_HELPTEXT                       :90 degree turns occur when a horizontal track is directly followed by a vertical track piece on the adjacent tile, thus making the train turn by 90 degree when traversing the tile edge instead of the usual 45 degrees for other track combinations.
+STR_CONFIG_SETTING_BACK_ONE_WAY_PBS_SAFE_WAITING                :Pathfind up to back of one-way path signals: {STRING2}
+STR_CONFIG_SETTING_BACK_ONE_WAY_PBS_SAFE_WAITING_HELPTEXT       :When enabled, the YAPF train pathfinder may pathfind up to the back of a one-way path signal.
 STR_CONFIG_SETTING_DISTANT_JOIN_STATIONS                        :Allow to join stations not directly adjacent: {STRING2}
 STR_CONFIG_SETTING_DISTANT_JOIN_STATIONS_HELPTEXT               :Allow adding parts to a station without directly touching the existing parts. Needs Ctrl+Click while placing the new parts
 STR_CONFIG_SETTING_INFLATION                                    :Inflation: {STRING2}