WIP: Swift Package Manage Support

[mman]

This PR is here for a reference and list of steps that need to be done in order to support Swift Package Manager correctly.

Here is the quick list of things that I have made in order to support Swift Package Manager on at least iOS, iPadOS, macOS, and macCatalyst.

• removed facebook sdk and long with all git submodules

• removed Carthage and Cocoapods related files

• removed Parse xcodeproj, xcworkspace, and xcconfig files

• removed Rakefile and Gemfile used to build binary distributions

• added Package.swift

• added dependency on Bolts and OCMock with SPM support

• moved files around to strictly adhere to public headers, and private headers and sources

• fixed includes for private headers

• wrapped platform specific code inside C #if statements as swift package support does not (yet) support this nicely

Not ready for merge, serves only as an inspiration and proof of concept

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[ricky641b]

Hi, @mman I have a doubt about this. Why this was needed?
removed Carthage and Cocoapods-related files
removed Parse xcodeproj, xcworkspace, and xcconfig files
removed Rakefile and Gemfile used to build binary distributions

[mman]

@ricky641b It was not necessary to remove Cocoapods and Carthage build files. But I did it to have clean table. To simplify Package.Swift I moved files around and did not test neither Carthage nor Cocoapods builds. I would leave them around and let CI verify that everything still builds.

Also, I removed the Facebook SDK as I do not need it but proper solution would be to depend on it via SPM as well…

[mtrezza]

See my comment #1453 (comment) regarding carthage and cocoapods.

[mtrezza]

Closing in favor of #1683