Update project and fix deprecations

[diegoserranoa]

Changes

• Update lowest supported version to iOS 12 and fix more deprecations (https://github.com/Wootric/WootricSDK-iOS/issues/59)
• Update build phases to fix cycle in dependencies
• Remove incorrect tests. These tests were basically testing Apple's implementation of NSOperationQueue
• Update social sharing to fix SLServiceTypeTwitter & SLServiceTypeFacebook deprecation (https://github.com/Wootric/WootricSDK-iOS/issues/55)
• Fix SPM support (https://github.com/Wootric/WootricSDK-iOS/pull/96 & https://github.com/Wootric/WootricSDK-iOS/issues/86)

[KoCMoHaBTa]

Tested SPM integration - Getting error that the package contains mixed sources.

Apparently at some point, some swift files were added. SPM cannot contain both Objcective-C and Swift source files at the same time.

Found the following swift files in the project:

• UIApplication+Extension.swift
• UIButton+Extension.swift

I think, these can easily be converted to Objective-C and everything should be fine

[diegoserranoa]

Aaah yes, these are new ones. Let me check this and update the PR. Thanks for testing @KoCMoHaBTa !

[KoCMoHaBTa]

Thanks for the update. One more issue - the package does not build. You should use #ifdef SWIFTPM_MODULE_BUNDLE instead of #if SWIFTPM_MODULE_BUNDLE

[KoCMoHaBTa]

Now it works. Thanks @diegoserranoa 🥳

[diegoserranoa]

@KoCMoHaBTa thanks for the review! I pushed a last commit to also fix it for Cocoapods 😅

[diegoserranoa]

Thanks for the help with this! I need someone from my team to also review and approve this and then I can merge and release the new version.