Switch to Swift Package Manager (#527)

* Initial removal of some fatalError calls

* Update for Nimble SPM limitations

Nimble doesn't support raiseException() when built with SPM
- paves way for SPM support and M1 support

* Update UInt8+ExtensionsTests.swift

Specify specific BitShiftError cases in test

* Let's just remove carthage while we're at it.

* Remove integration-tests-carthage from config.yml

* Update fastlane Fastfile for removing carthage

* Linter errors

* Updates for comments

* Fix config.yml

* Update ObjCThrowExceptionMatcher.swift

* private instead of fileprivate, I always forget which is more restrictive

IntegrationTests/XcodeDirectIntegration/XcodeDirectIntegration.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -0,0 +1,43 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "CwlCatchException",
+        "repositoryURL": "https://github.com/mattgallagher/CwlCatchException.git",
+        "state": {
+          "branch": null,
+          "revision": "682841464136f8c66e04afe5dbd01ab51a3a56f2",
+          "version": "2.1.0"
+        }
+      },
+      {
+        "package": "CwlPreconditionTesting",
+        "repositoryURL": "https://github.com/mattgallagher/CwlPreconditionTesting.git",
+        "state": {
+          "branch": null,
+          "revision": "02b7a39a99c4da27abe03cab2053a9034379639f",
+          "version": "2.0.0"
+        }
+      },
+      {
+        "package": "Nimble",
+        "repositoryURL": "https://github.com/Quick/Nimble.git",
+        "state": {
+          "branch": null,
+          "revision": "af1730dde4e6c0d45bf01b99f8a41713ce536790",
+          "version": "9.2.0"
+        }
+      },
+      {
+        "package": "OHHTTPStubs",
+        "repositoryURL": "https://github.com/AliSoftware/OHHTTPStubs.git",
+        "state": {
+          "branch": null,
+          "revision": "12f19662426d0434d6c330c6974d53e2eb10ecd9",
+          "version": "9.1.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}