Refactor PDF Renaming Tool: Transition to YAML Configuration and Modularize Code

- Removed VERSION file and harmonized company names JSON example.
- Refactored autorename-pdf.py to utilize YAML configuration instead of .env and JSON files.
- Introduced new modules: _ai_clients.py, _ai_processing.py, _config_loader.py, _document_processing.py, _pdf_utils.py, and _utils.py for better code organization.
- Updated setup script to read OCR languages from YAML configuration.
- Enhanced PDF processing with improved error handling and logging.
- Added example YAML configuration files for both main configuration and harmonized company names.
- Removed deprecated pdf_processor.py and harmonized-company-names.json.
- Updated requirements.txt to reflect new dependencies.

Author: ptmrio

.env.example

@@ -2,11 +2,11 @@
 /build/
 /dist/
 /venv/
-/dist/harmonized-company-names.json
-/dist/.env
+/dist/harmonized-company-names.yaml
+/dist/config.yaml
 build.py
-.env
-harmonized-company-names.json
+config.yaml
+harmonized-company-names.yaml
 autorename-pdf-release.zip
 *.pdf
 *.exe