[ios] Info.plist cleanup

[kambala-decapitator]

Description

Sorts keys alphabetically, removes hardcoded keys, sets real app version.

Motivation and Context

Now installed version can be seen immediately in Xcode's Devices window without the need to open app, also fixes Xcode warning "existing info.plist key will be overwritten".

How Has This Been Tested?

Compiled and ran on a device.

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed