Unit Converter

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Release version 1.6:
- Fixed number format bugs and change resonance frequency layout.
- Re-design main layouts and style for entire text.
- Add World Time Zone conversion, support 172 cities on the Earth. Including Daylight Saving Time for Euro, Australia, and north America (the accuracy rely on time set up on user's smart phone).
- Support speed conversion.
- Add mechanical tool size conversion (wrench, nut, socket...) from imperial to metric.