Macros

[csboo]

Features:

• Introduced macros for code generation in the Parser module.

Refactoring & Cleanup:

• Changed to macro-based getters and setters for the Arg module.
• Moved 'Parsable' and its implementations to a new header file, Parsables.hpp.
• Removed all unused imports across the codebase.
• Cleaned up old and unused code in the Parser and Arg modules.
• Eliminated redefinition of int64_t and uint64_t in Parsables.