Integrate Mac-compatible MatrixSDKCrypto

[Anderas]

We don't really need to support Crypto V2 on the mac, but it does allow us to remove a bunch of annoying compiler flags and finally run unit tests on CI that runs against macos target

[codecov]

Codecov Report

Base: 13.66% // Head: 15.72% // Increases project coverage by +2.06% 🎉

Coverage data is based on head (06c67a2) compared to base (66df019).
Patch coverage: 5.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           andy/qr_refactor    #1603      +/-   ##
====================================================
+ Coverage             13.66%   15.72%   +2.06%     
====================================================
  Files                   543      572      +29     
  Lines                 86944    90664    +3720     
  Branches              36924    38283    +1359     
====================================================
+ Hits                  11880    14258    +2378     
- Misses                74620    75939    +1319     
- Partials                444      467      +23     

Impacted Files	Coverage Δ
...xSDK/Crypto/CrossSigning/Data/MXCrossSigningInfo.m	31.37% <ø> (+31.37%)	⬆️
...rossSigning/Data/MXCryptoUserIdentityWrapper.swift	100.00% <ø> (ø)
...Crypto/CrossSigning/MXCrossSigningInfoSource.swift	100.00% <ø> (ø)
...trixSDK/Crypto/CrossSigning/MXCrossSigningV2.swift	27.11% <ø> (ø)
...trixSDK/Crypto/CryptoMachine/MXCryptoMachine.swift	0.00% <0.00%> (ø)
...rixSDK/Crypto/CryptoMachine/MXCryptoRequests.swift	29.22% <ø> (ø)
...chine/MXEventDecryptionResult+DecryptedEvent.swift	0.00% <ø> (ø)
...DK/Crypto/Devices/Data/MXCryptoDeviceWrapper.swift	100.00% <ø> (ø)
MatrixSDK/Crypto/Devices/Data/MXDeviceInfo.m	26.43% <ø> (+9.66%)	⬆️
MatrixSDK/Crypto/Devices/MXDeviceInfoSource.swift	100.00% <ø> (ø)
... and 70 more

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