dlls/oleaut32: Vastly cleanup and make consistent fnIsName() and fnFindName()
Make both method calls;
- Consistently written with parameter names as per spec.
- Fix parameter validation to be consistent with spec.
- Fix szNameBuf parameter semantics as per spec.
- Fix szNameBuf casing str search as per spec.
- Factor out common code into TLB_ helpers vastly improves readability.
Edited by Edward OC