Fix #14: Enable trim_trailing_whitespace and clean up source code formatting

[Copilot]

This PR addresses issue #14 by implementing the requested code formatting standardization, specifically focusing on trailing whitespace cleanup.

Changes Made

1. Updated .editorconfig

• Uncommented and enabled trim_trailing_whitespace = true setting
• This ensures future edits will automatically trim trailing whitespace

2. Cleaned up source code

• Removed trailing whitespace from 6 Python source files in the keyvalues3/ directory:
  • keyvalues3/__init__.py
  • keyvalues3/binaryreader.py
  • keyvalues3/kv3file.py
  • keyvalues3/textreader.py
  • keyvalues3/utils/buffer.py
  • keyvalues3/utils/compression.py

3. Preserved test files

• As requested, no modifications were made to any files in the tests/ directory
• All existing functionality is preserved

Verification

• ✅ All existing tests continue to pass (31 tests passed)
• ✅ Module imports and basic functionality verified
• ✅ Zero trailing whitespace remaining in source files
• ✅ Changes are purely cosmetic (whitespace-only modifications)

The changes are minimal and surgical, affecting only trailing whitespace without altering any code logic or functionality. The diff shows 56 insertions and 57 deletions, resulting in a net reduction of 1 line due to whitespace cleanup.

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