Add rebindable keys, refactor lists

src/config.rs

@@ -1,7 +1,10 @@
+use std::collections::HashMap;
+
 pub const CLIENT_ID: &str = "d420a117a32841c2b3474932e49fb54b";
 
 #[derive(Serialize, Deserialize, Debug, Default)]
 pub struct Config {
     pub username: String,
     pub password: String,
+    pub keybindings: Option<HashMap<String, String>>,
 }