Cleans up and removes TODOs, adds tests (#844)

* removes version ordering from v2; simplifies now-unecessary three-level faceting

* resolved some todos

* test for game version updating

* merge fixes; display_categories fix

src/validate/mod.rs

@@ -132,7 +132,7 @@ pub async fn validate_file(
                 .find_map(|v| MinecraftGameVersion::try_from_version_field(&v).ok())
                 .unwrap_or_default();
             let all_game_versions =
-                MinecraftGameVersion::list_transaction(&mut *transaction, redis).await?;
+                MinecraftGameVersion::list(None, None, &mut *transaction, redis).await?;
             validate_minecraft_file(
                 data,
                 file_extension,