Add setting to use object land ground for purchased land

Default on

src/table/settings/world_settings.ini

@@ -881,6 +881,15 @@ strhelp  = STR_CONFIG_SETTING_ALLOW_CONVERT_TOWN_ROAD_NO_HOUSES_HELPTEXT
 cat      = SC_EXPERT
 patxname = ""construction.convert_town_road_no_houses""
 
+[SDT_BOOL]
+var      = construction.purchased_land_clear_ground
+flags    = SF_PATCH
+def      = true
+str      = STR_CONFIG_SETTING_PURCHASED_LAND_CLEAR_GROUND
+strhelp  = STR_CONFIG_SETTING_PURCHASED_LAND_CLEAR_GROUND_HELPTEXT
+post_cb  = [](auto) { MarkWholeNonMapViewportsDirty(); }
+cat      = SC_BASIC
+
 [SDT_VAR]
 var      = construction.raw_industry_construction
 type     = SLE_UINT8