Unit Converter

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Ver.1.5.1:
Add custom items sorting.
Add file backup and restore.
Exchange rate plus nation flag.
Ver.1.5.2:
Add a calculator keyboard.
Exchange rate can be updated regularly.
Base Currency and Term Currency can be switched.
Ver.1.5.3:
Change the layout and correct the error.
Fixed an issue where the keyboard was overridden by the ad.
Ver.1.6.6:
Improve exchange rate access performance, increase more units, simplify layout, correct the error.