Malformed Xcode workspace/project handling

[lacasseio]

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This epic will track the various error handling cases around malformed Xcode workspaces/projects. There is a minimal amount of Xcode files that are required to set up the Gradle project structure. If those files contain syntax errors, we currently crash the build. This behaviour prevents the user from accessing any of the help tasks (i.e. help, projects, tasks, diff/merge, etc.). We should have some leniency in terms of malformed Xcode files.