Add support for a Package-config.json to specify defaults for environment variables #174
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When opening the project in Xcode, I always needed to edit the package manifest to point to the correct SourceKit search path, undo the changes to rebase etc. That's annoying.
Allow the a
Package-config.jsonnext to thePackage.swiftfile, which is consulted for default values for the environment variables (environment variables still take precedence). That config file is in.gitignore, so it can persist between git operations.