Replace external `requests` calls with `urllib` to eliminate third‑party dependency, add robust timeout handling, and improve error reporting. This also standardises URL fetching across the module and updates the process name configuration.
Enhancements:
- Added default request timeout fallback and ensured proper cleanup of response objects
- Enriched exception messages for better debugging
Bug Fixes:
- Fixed potential timeout‑related crashes in `CurrencyCache` and `Conversion`
- Corrected process name setting via `set_process_name` in the entry point
sankalp