[junkmd]

Summary

The main goal of this PR is to clean up our code.
I removed old code that was no longer used (dead code) from the parser and code generator. Now, the code returns early when it finds unnecessary steps. This makes the code shorter and simpler.
Specifically, I cleaned up warnings in Parser, extra steps for IUnknown / IDispatch, and unused methods or inheritance code in structures.

This cleanup is safe because Structure and Union are only for data types in COM Automation rules. In COM TYPEKIND:

• TKIND_RECORD means "a structure with no methods."
• TKIND_UNION means a union where members share the same memory location.
• On the other hand, types with methods are defined separately as TKIND_INTERFACE or TKIND_DISPATCH.

So, records and unions only need information about data, such as fields, sizes, and alignments.
They do not need methods, constructors, base classes, or IIDs. Microsoft's COM type descriptions document also says that structures and unions do not have functions.
Now, Structure / Union handle data, and ComInterface / DispInterface handle behaviors. This matches the COM rules.

Impacts

• The code for parsing and code generation is shorter because unused branches for methods, constructors, base classes, and IIDs were removed.
• Parser handles IUnknown, IDispatch, and warnings more simply, so it can stop early.
• The model and code generation for COM records and unions now match the official rules for data types.
• Valid type libraries do not give methods, constructors, base classes, or IIDs to records or unions. So, there is no change in normal output.
• Field generation for records and unions and packing by size and alignment still work as before.
• Code paths for interface methods, IIDs, and base interfaces did not change. There is no impact on ComInterface or DispInterface.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.90%. Comparing base (273f5b2) to head (c59788d).

Files with missing lines	Patch %	Lines
comtypes/tools/codegenerator/codegenerator.py	54.54%	5 Missing ⚠️
comtypes/tools/tlbparser.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #976      +/-   ##
==========================================
+ Coverage   89.61%   89.90%   +0.29%     
==========================================
  Files         143      143              
  Lines       14247    14192      -55     
==========================================
- Hits        12768    12760       -8     
+ Misses       1479     1432      -47     

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