Pytorchfi

- Bug fixes & performance improvements
- Weight injection fixes

- Bug fixes & code improvements

- Improved code quality, performance
- Improved testing suite
- Standardize naming conventions for API

Major changes:
- Add support for error injection into any layer type
- Generalize function calls and internal scripts for different layer types
- Remove `util` and streamline package import
- General code clean up, improvements, bug fixes

Weight injection implementation
Minor fixes