feat!: Account features

- Bump version to 0.2.0
- Added trait SquadObject
- Implemented SquadObject for Quest and Account
- Implemented Config::load_accounts
- Removed src/quest/error.rs
- Added account tests in tests/main.rs

BREAKING CHANGE: Quest::{load,delete,save} are now provided by
SquadObject trait

src/bin/cli.rs

@@ -2,7 +2,7 @@ use std::path::PathBuf;
 
 use clap::{Parser,Subcommand,Args,ValueEnum};
 use serde::Deserialize;
-use squad_quest::{config::Config,quest::{Quest,QuestDifficulty as LibQuestDifficulty}};
+use squad_quest::{SquadObject, config::Config, quest::{Quest,QuestDifficulty as LibQuestDifficulty}};
 use toml::value::Date;
 use chrono::{Datelike, NaiveDate, Utc};