Screenshot tests (#130)

* #9 Add snapshot testing library

* #9 Create script to boot test simulators

* #9 Create the UI test plan

* #9 Create shared schemes for test targets

* #9 Disable split view for UI tests

* #9 Fix fastlane dependencies

* #9 Add snapshot testing to the application

* #9 assert screenshots

* #9 fix swipe gestures on iPad

* #9 Fix accessing items in session verification screen

* #9 Workaround for flaky unit test

* #9 Specify scheme for alpha build

* #9 Add reference screenshots

* Update python script path and check assets for png check

* Update script path

* Use static timezone for simulator time

* Fix build after SwiftFormat

* Add changelog

* Upload failed screenshots artifact

* Always upload artifacts

* Update boot simulator script

* Update simulator overridden time

* Install pytz before tests

* Get time from Ruby script

* Disable SwiftUI animation when running UI tests

* Update screenshots after animation setting

* Include reference images in the artifact

* Update matching precision

* Update image matching precision & revert artifact content

* Include Xcode result in the artifact

* Update test output directory

* Disable gradient on splash screen for tests

* Tap next button explicitly

* Wait a bit before checking alert

* Wait 1 second

* Run SwiftFormat on project

* Ignore temporary screenshots

* Fix most of the PR remarks

* Fix conflicts

* Bump Python version to 3

* Update reference screenshots for authentication screens

* Update SwiftFormat

* Fix flakey session verification test.

* Update scheme.

Co-authored-by: Doug <douglase@element.io>

ElementX.xcodeproj/xcshareddata/xcschemes/ElementX.xcscheme

@@ -63,13 +63,6 @@
       </Testables>
       <CommandLineArguments>
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-      <EnvironmentVariables>
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       <CodeCoverageTargets>
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ElementX.xcodeproj/xcshareddata/xcschemes/UITests.xcscheme

@@ -0,0 +1,100 @@
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+   version = "1.7">
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+      buildImplicitDependencies = "YES"
+      runPostActionsOnFailure = "NO">
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+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
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+               ReferencedContainer = "container:ElementX.xcodeproj">
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+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      onlyGenerateCoverageForSpecifiedTargets = "NO"
+      shouldUseLaunchSchemeArgsEnv = "YES">
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+            default = "YES"
+            reference = "container:UITests/SupportingFiles/UITests.xctestplan">
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+      <CommandLineArguments>
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+   <LaunchAction
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+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

ElementX.xcodeproj/xcshareddata/xcschemes/UnitTests.xcscheme

@@ -0,0 +1,113 @@
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+   version = "1.7">
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+      buildImplicitDependencies = "YES"
+      runPostActionsOnFailure = "NO">
+      <BuildActionEntries>
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+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
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+      </BuildActionEntries>
+   </BuildAction>
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+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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+      onlyGenerateCoverageForSpecifiedTargets = "NO"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      systemAttachmentLifetime = "keepNever">
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+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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