feat(discord): Added /balance {give,set} commands

- Also, you cannot /answer to unpublished quest
- Also, changed /scoreboard to print name instead of mentioning
- Also, made --config an option, defaulting to "cfg/config.toml"

discord/src/error.rs

@@ -13,6 +13,8 @@ pub enum Error {
     BothChannelAndUser,
     SerenityError(serenity::Error),
     SquadQuestError(squad_quest::error::Error),
+    AccountNotFound,
+    InsufficientFunds(u32),
 }
 
 impl From<serenity::Error> for Error {
@@ -38,6 +40,8 @@ impl Display for Error {
             Self::BothChannelAndUser => write!(f, "both channel and user was specified"),
             Self::SerenityError(_) => write!(f, "discord interaction error"),
             Self::SquadQuestError(_) => write!(f, "internal logic error"),
+            Self::AccountNotFound => write!(f, "account not found"),
+            Self::InsufficientFunds(amount) => write!(f, "account does not have {amount} points"),
         }
     }
 }
@@ -50,7 +54,9 @@ impl std::error::Error for Error {
             Self::QuestIsCompleted(_) |
             Self::NoContent |
             Self::NoChannelOrUser |
-            Self::BothChannelAndUser => None,
+            Self::BothChannelAndUser |
+            Self::AccountNotFound |
+            Self::InsufficientFunds(_) => None,
             Self::SerenityError(error) => Some(error),
             Self::SquadQuestError(error) => Some(error),
         }