MacOS compatibility added

[chitkosarvesh]

Summary of Changes Made

1. Added platform-specific headers: Conditionally include the appropriate headers for Linux (sys/timerfd.h, endian.h) and macOS (libkern/OSByteOrder.h)
2. Added macOS endian conversion macros: Defined htole32() and related functions using macOS's OSSwap* functions
3. Made timer code platform-specific: Used #ifdef blocks to provide different timer implementations:
   ◦ Linux: Original timerfd_create() and timerfd_settime()
   ◦ macOS: nanosleep() for timing intervals
4. Updated the main loop: Added platform-specific timing logic while keeping the rest of the functionality the same

The code now compiles successfully on macOS while maintaining compatibility with Linux systems.

Sarvesh Chitko, OH2DTC

[cyanide-burnout]

LOL! Thanks ;)
Why not kqueue timer?

[chitkosarvesh]

Well, no other reason than the implementation complexity.

[cyanide-burnout]

Well, no other reason than the implementation complexity.

Timing accuracy?

[chitkosarvesh]

Now that I look at it, I don't think nanosleep is a good implementation. Let me rework it a bit, I am considering kqueue_timer or grand central dispatch (dispatch_source_set_timer()). Will update the PR.