The Great Rename

• BREAKING MockEquatable has been renamed to Matcher to more closely express functionality provided (there is a typealias for backwards compatibility but it might still be breaking in some cases)
• BREAKING Mock.storage type has been changed from [RecordedCall] to Storage to better support future features (like e.g. the recording of return values)
• BREAKING Calling verify will now reset previously recorded values
• Added option to record values that should be returned for specific invocations
• Added option to provide a custom failure message for a matcher