Start refactor of ynab by splitting it up

src/main.rs

@@ -115,7 +115,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             plan,
             plan_id,
         } => {
-            let plan = Lookup::try_from((plan, plan_id))?;
+            let plan = Lookup::from_options(plan, plan_id)?;
             let accounts = Ynab::new(&token).list_accounts(plan)?;
             println!("Available accounts in plan:");
             for account in accounts {
@@ -132,8 +132,8 @@ fn main() -> Result<(), Box<dyn Error>> {
             format,
             inputs,
         } => {
-            let plan = Lookup::try_from((plan, plan_id))?;
-            let account = Lookup::try_from((account, account_id))?;
+            let plan = Lookup::from_options(plan, plan_id)?;
+            let account = Lookup::from_options(account, account_id)?;
 
             let transactions = read_transactions_from(&inputs, &format)?;