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Add KRW <-> EUR conversion feature
Add thousands separators to the updated currency amount
Parse correctly amounts containing spaces as thousands separators
Format amount when the component loses focus
Always show decimals in amount updated via conversion

Special case for better UX: if either amount becomes empty, the other
amount is emptied too.
Empty the other amount when the amount that lost focus is emptied

Renamed the 'ignoreAmountUpdate' variable to 'allowAmountUpdate', the
positive form is easier to reason about.
Rename method updateAmounts to updateOtherAmount
Extract method called when amount loses focus
Refactor listener addition
Create repository in GitHub
Add link to GitHub page to README