Swift Package Manager support

[lordcodes]

I have:

• searched open and closed issues for duplicates

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Issue description

When using Xcode 11 many developers will inevitably be moving dependencies over to the Swift Package Manager instead of using Cocoapods or Carthage.

[vixentael]

SPM support is definitely on our list, but we'd be happy to get some help here :)

[vixentael]

As Apple Silicon is here, and it makes impossible to have .framework that contains arm64 slice and arm64-iphonesimulator slice, we're looking at building Themis as .xcframework now.

[heysaik]

Any updates to this?

[vixentael]

work in progress, a bit stuck with xcframework'ing openssl

[vixentael]

I don't lie — we are working on SPM! :)
@julepka

[Xcode is tricky to work with large C-based projects, so for starters we will distribute ThemisSPM as built XCFramework, not as code.]

#789 (review)
cossacklabs/openssl-apple#22

ETA: couple of weeks for beta release, ~1-2 month for stable release with docs and examples.

[vixentael]

It's official!

Since 0.13.8 Themis supports SPM!

Checkout docs:
https://docs.cossacklabs.com/themis/languages/swift/installation/#installing-with-spm

Viva @julepka 👏

[heysaik]

Awesome thank you!