chore: General cleanup

- Changed some info!() statements to debug!() and warn!()
- Removed most Turbofish syntax cases
- Removed InvalidCodeError and replaced it with InvalidResponse

Signed-off-by: quexeky <git@quexeky.dev>

src-tauri/src/games/downloads/download_agent.rs

@@ -15,6 +15,7 @@ use crate::DB;
 use log::{debug, error, info};
 use rayon::ThreadPoolBuilder;
 use slice_deque::SliceDeque;
+use std::collections::HashMap;
 use std::fs::{create_dir_all, File};
 use std::path::Path;
 use std::sync::mpsc::Sender;
@@ -157,7 +158,7 @@ impl GameDownloadAgent {
             ));
         }
 
-        let manifest_download = response.json::<DropManifest>().unwrap();
+        let manifest_download: DropManifest = response.json().unwrap();
 
         if let Ok(mut manifest) = self.manifest.lock() {
             *manifest = Some(manifest_download);