Fix for xcode 11 + iOS Framework

[FabienLydoire]

The current code has not been updated in more than 3 years.
In this PR, I propose to :

• Fix the build settings and syntax for Xcode 11
• Fix the Unit Tests : for an unknown reason the file hash are different than the target ones from the unit tests
• Build the SDK as 2 frameworks : 1 for device and 1 for simulator

[zmj]

Hey Fabien, thanks so much for your work. I've asked internally whether we can accept your PR or refer visitors to your fork until this repo is updated. I probably won't have an update until January, but wanted to let you know that it's being discussed.

[FabienLydoire]

Hey @zmj !
These are great news. Waiting for your feedback after end of year holidays then.

[zmj]

Unfortunately, we're not able to accept PRs from outside of Citrix at this time. This repo's readme has been updated to refer visitors to your fork - thank you again for working on this!