Platform-specific version number enhancements

[robinnorth]

Currently, whilst the build tool sets Android, iOS and macOS-specific application/package/bundle version numbers, it doesn't do so for UWP.

Additionally, certain platforms (iOS, macOS, UWP) have specific version number format requirements that it would be good to try and implement automatically (perhaps via settings opt-in?). For example, a macOS bundle version must be no longer than three period-separated integers and include no other characters. If the Super Unity Build version number template breaks these rules, manual modification of the generated Xcode project will be required before an App Store-compatible release can be built.

• UWP package version support
• Conform to macOS bundle version string format requirements
• Conform to iOS bundle version string format requirements
• Set Android bundle version code from build counter?