Add !classjob debug command to change your class/job

This is the workaround for lack of a proper class/job switch when
equipping different weapons.

USAGE.md

@@ -93,6 +93,7 @@ These special debug commands start with `!` and are custom to Kawari.
     * Territory `182`, Event `1245187` plays the Ul'dah opening sequence
     * Territory `183`, Event `1245186` plays the Gridania opening sequence
 * `!spawnclone`: Spawn a clone of yourself
+* `!classjob <id>`: Changes to another class/job
     
 ### GM commands
 

src/world/chat_handler.rs

@@ -321,7 +321,6 @@ impl ChatHandler {
             }
             "!spawnclone" => {
                 // spawn another one of us
-
                 let player = &connection.player_data;
 
                 let mut common = connection
@@ -348,6 +347,12 @@ impl ChatHandler {
                     })
                     .await;
             }
+            "!classjob" => {
+                let parts: Vec<&str> = chat_message.message.split(' ').collect();
+
+                connection.player_data.classjob_id = parts[1].parse::<u8>().unwrap();
+                connection.update_class_info().await;
+            }
             _ => tracing::info!("Unrecognized debug command!"),
         }
     }