Refactor function signatures and improve readability in pe_synth.h and pe_synth_cuda_u64_cones.cu

- Adjusted formatting of function signatures for better alignment and clarity.
- Consolidated parameters in CUDA function calls to single lines for improved readability.
- Enhanced consistency in operator spacing and control flow structures, contributing to overall code style and maintainability.
- Updated CUDA kernel definitions to follow a more uniform style, ensuring better comprehension of the code structure.

Author: MacroModel