Feat:

• Implement support for interfaces implementing interfaces (#740), huge kudos to @Kingdutch

Deprecates:

• Constant BreakingChangeFinder::BREAKING_CHANGE_INTERFACE_REMOVED_FROM_OBJECT. Use BreakingChangeFinder::BREAKING_CHANGE_IMPLEMENTED_INTERFACE_REMOVED instead. Constant value also changed from INTERFACE_REMOVED_FROM_OBJECT to IMPLEMENTED_INTERFACE_REMOVED.

• Constant BreakingChangeFinder::DANGEROUS_CHANGE_INTERFACE_ADDED_TO_OBJECT Use DANGEROUS_CHANGE_IMPLEMENTED_INTERFACE_ADDED instead. Constant value also changed from INTERFACE_ADDED_TO_OBJECT to IMPLEMENTED_INTERFACE_ADDED.

Refactoring:

• Reify AST node types and remove unneeded nullability (#751)