Suggested project fixes/changes

[tonyarnold]

This PR is a recommendation for some changes you could make to simplify the maintenance of the project.

There are three main changes in this PR:

• Removes the macOS framework dependency from the iOS test target
• Removes and reorganises the orphaned Info.plist files in the project
• Converts the targets and schemes to a single multi-platform variant that will build for the appropriate platform at build time

Completely up to you if you want to cherry pick ideas from this instead of accepting it as-is.

[coveralls]

Coverage increased (+4.8%) to 85.816% when pulling f2169a1 on tonyarnold:fix/project-issues into c53646a on iwasrobbed:master.

[128keaton]

Wow! Looks great! Thanks!

[iwasrobbed]

Thanks @tonyarnold (and @128keaton for reviewing); also, I added you as a collaborator