Switch factory trait over to i32 IDs

rc_core/src/persist/config/traits.rs

@@ -311,7 +311,7 @@ pub struct VehicleInfo {
 #[derive(Clone, Debug)]
 pub enum VehicleDescriptor {
     Factory {
-        factory: u32,
+        factory: i32,
     },
     Database {
         garage: i32,

rc_core/src/persist/garage.rs

@@ -200,7 +200,7 @@ impl PrefabVehicle {
 pub enum PrefabId {
     Factory {
         #[serde(alias="crf")]
-        factory: u32,
+        factory: i32,
     },
     Database {
         garage: i32,

rc_core/src/persist/user/account_json.rs

@@ -451,7 +451,7 @@ impl UserData {
                     Ok(Some(factory_vehicle)) => {
                         let uuid_i64 = crate::persist::user::uuid_sanitize(
                             standard_uuid_uniqueness
-                            ^ crate::persist::user::i64_join((1 << 30, *factory_id))
+                            ^ crate::persist::user::i64_join((1 << 30, *factory_id as u32))
                         );
                         let uuid_str = crate::persist::user::i64_as_uuid_str(uuid_i64);
                         let weapons_guess = weapon_order.guess_weapons(&mut std::io::Cursor::new(&factory_vehicle.0.cube_data));