Type test: [TDD] Refine exceptions for invalid types.
Type: Refine exceptions for invalid types.
Type test: [TDD] Refine testing for invalid types.
Type: Refine testing for invalid types.

* Deprecate signal_error.
* Deprecate LlamaInvalidTypeError.
Test, Test type: Clean-up Validator.

* Drop signal_error.
* Retain LlamaInvalidTypeError only as interface.
* Deprecate logger.
Type, Type test: Remove logger from Validator.
Type test: KISS Validator testing.
Type: Turn Validator stubs into staticmethods.

* Add FIXME to turn Validator class into closure.
Type test: [TDD] Refine exceptions for bad typedefs.
Type: Refine exceptions for bad typedefs.
Type test: [TDD] Refine testing for bad typedefs.
Type: Refine testing for bad typedefs.

* Deprecate signal_error.
* Deprecate instantiation of LlamaBadTypeDefError.
Type: Clean-up Table.

* Drop signal_error.
* Retain LlamaBadTypeDefError only as interface.
* Deprecate logger.
Type, Type test: Drop logger from Table.
Type, Type test: Purge unused imports.
Test type: Groom code.
Type, Type Test: Consistent CamelCase.
Type, Test Type: Remove Llama prefix.
Type, Test Type: Consistent camel case (2).
Type test: Saner testing of exceptions API.