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When RuntimeOptionsFactory builds RuntimeOptions if the target class is a member of a class hierarchy contained in one package the glue path with have multiple entries for the containing package. This will then cause a "duplicate step definition" error during duplicated scans of the glue path (see #622).
This pull request aims to eliminate duplicate glue paths by changing the type of RuntimeOptions.glue from a list to a set. This will enforce uniqueness, always.
The main change is RuntimeOptions.glue. The remaining changes are to update the signature of Backend.loadGlue() to accept a set (instead of a list) of glue paths.