- Added a new bandwidth enum value for 7.8MHz and corresponding string conversion function.
- Introduced a string conversion function for coding rates.
- Implemented a utility function to safely convert uint8_t to optional for spreading factors.
- Enhanced the modulation parameters structure with a to_string method for better representation.
- Introduced new enums for LoRa bandwidth and coding rate to improve clarity.
- Updated default values for preamble length, frequency, bandwidth, and coding rate.
- Added new structures for modulation and packet parameters, encapsulating related settings.
- Refactored functions to utilize the new structures, improving parameter management in the llcc68 component.
- Added a comprehensive .gitignore file to exclude unnecessary files and directories for various platforms and tools.
- Removed the llcc68.cpp source file as part of the refactoring process.
- Updated llcc68.hpp to replace the `init_exti` function declaration with inline interrupt configuration logic.
- Changed `EXTI_PIN` to `EXTI_PINS` for clarity and consistency.
- Refactored the handling of CAD parameters and improved type safety by using `enum class` for `CAD_EXIT_MODE` and `CAD_SYMB`.
