small tweaks, cleanup, and cranks offset

src/raws/mod.rs

@@ -68,8 +68,8 @@ macro_rules! impl_ParseJson {
         $(impl ParseJson for $t {
             fn parse_raws_into_vector(path: String) -> $t {
                 let raw_data = rltk::embedding::EMBED.lock().get_resource(path).unwrap();
-                let raw_string = std::str::from_utf8(&raw_data).expect("Unable to convert to a valid UTF-8 string.");
-                return serde_json::from_str(&raw_string).expect("Unable to parse items.json");
+                let raw_string = std::str::from_utf8(&raw_data).expect("Failed to convert UTF-8 to &str.");
+                return serde_json::from_str(&raw_string).expect("Failed to convert &str to json");
             }
         })*
     }

src/raws/rawmaster.rs

@@ -697,6 +697,8 @@ pub enum SpawnsAs {
     LargeGroup,
 }
 
+/// Looks up a key in the mob index, and if a corresponding mob is found, searches the
+/// entry for a group spawn flag. i.e. SMALL_GROUP/LARGE_GROUP.
 pub fn get_mob_spawn_type(raws: &RawMaster, key: &str) -> SpawnsAs {
     if raws.mob_index.contains_key(key) {
         let mob_template = &raws.raws.mobs[raws.mob_index[key]];