Make solar car more rare (#75617)

* 'obsolete' solar car

* unobsolete, spawn car on a speedway with small chance

* delete missed file, update information about veh migration

data/json/mapgen/speedway.json

@@ -446,6 +446,7 @@
       ],
       "palettes": [ "speedway_palette" ],
       "items": { "R": { "item": "mechanics", "chance": 40, "repeat": [ 1, 6 ] }, "n": { "item": "SUS_welding_gear", "chance": 50 } },
+      "place_vehicles": [ { "vehicle": "rara_x", "x": 36, "y": 55, "rotation": 90, "chance": 30 } ],
       "place_loot": [
         { "item": "tire_medium_slick", "x": [ 36, 38 ], "y": 50, "repeat": [ 6, 9 ] },
         { "item": "tire_medium_slick", "x": [ 41, 43 ], "y": 74, "repeat": [ 6, 9 ] },

data/json/vehicle_groups.json

@@ -306,7 +306,6 @@
       [ "van_full-size", 600 ],
       [ "van_cargo", 400 ],
       [ "van_camper", 200 ],
-      [ "rara_x", 800 ],
       [ "apc", 300 ],
       [ "apc-gl", 100 ],
       [ "aapc-mg", 100 ],
@@ -577,7 +576,6 @@
       [ "golf_cart", 300 ],
       [ "scooter", 300 ],
       [ "bicycle", 1000 ],
-      [ "rara_x", 300 ],
       [ "unicycle", 100 ],
       [ "bicycle_electric", 200 ],
       [ "motorcycle", 500 ],
@@ -1251,7 +1249,6 @@
     "vehicles": [
       [ "electric_car", 100 ],
       [ "suv_electric", 70 ],
-      [ "rara_x", 40 ],
       [ "car_luxury", 40 ],
       [ "car_micro", 40 ],
       [ "car_micro_hybrid", 40 ],

data/mods/No_Hope/vehicle_groups.json

@@ -56,7 +56,6 @@
       [ "car_fbi", 300 ],
       [ "truck_swat", 200 ],
       [ "hippie_van", 1000 ],
-      [ "rara_x", 800 ],
       [ "apc", 300 ],
       [ "apc-gl", 100 ],
       [ "aapc-mg", 100 ],

doc/OBSOLETION_AND_MIGRATION.md

@@ -44,6 +44,10 @@ Additionally, `COMESTIBLE` items have temperature and rot processing, and are th
 * In most cases, the item has no other features that require it to remain activated, in which case it can be simply added to `temperature_removal_blacklist`.  Items in this list will be deactivated and have temperature-related data cleared *without any further checks performed*.
 * In case of an item that may be active for additional reasons other than temperature/rot tracking, an instance of the item loaded from existing save file cannot be blindly deactivated -- additional checks are required to see if it should remain active.  Instead of adding to the above list, a separate special case should be added in `src/savegame_json.cpp` to implement the necessary item-specific deactivation logic.
 
+# Vehicle migration
+
+Vehicles do not need any migration, simple deletion is enough
+
 # Vehicle part migration
 Migrating vehicle parts is done using `vehicle_part_migration` type, in the example below - when loading the vehicle any part with id `from` will have it's id switched to `to`.
 For `VEH_TOOLS` parts only - `add_veh_tools` is a list of itype_ids to add to the vehicle tools after migrating the part.