toString() for filter
Don't duplicate overloaded functions in getting all descriptors
Minor: code enhancements
Dropped redundant interface
LTDA: Make BuiltinsReferenceResolver compatible with Lazy TDA
LTDA: Move prohibited 'class object' to the list with extra class objects descriptors in lazy resolve
LTDA: Don't read CONSTRUCTOR slice in backend

 Usages from DECLARATIONS_TO_DESCRIPTORS are left
LTDA: Make supertypes in lazy type parameters be recorded in order of declaration
LTDA: Register script files in packages slice