DoveCard: Share Business Cards

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- Added the option to register and log in using third-party services (Apple and Google accounts)
- Reduced the personal information needed at registration to hasten the process
- Added the option to copy the My BizCard code with the long-press feature
- Added the option to copy Group Exchange codes with the long-press feature
- Set the time limit for a People Nearby search to 60 seconds
- Optimized the UI for better app performance
- General bug fixes