Add an opt-in CMake hook for Netatalk/libatalk and a small nwconn-side helper
layer for future AFP/Mac namespace work.
NetWare AFP NCP 0x23 calls still have to be decoded and answered by MARS-NWE;
libatalk is not used as an afpd proxy. Instead, expose local helper wrappers
that can read AppleDouble/Finder Info metadata and resource-fork sizes from a
backing Unix path when libatalk is available.
The WebSDK documents the AFP calls as NetWare server entry points for Mac
namespace semantics, and the SDK headers expose probes such as NWAFPSupported()
plus AFP entry-id and file-information calls. Those calls require AFP entry
IDs, Finder Info, resource forks, and per-volume Mac namespace state before
MARS-NWE can return success.
Keep NCP 0x23 returning invalid namespace for now, but record whether the
libatalk metadata backend was compiled in when rejecting AFP calls. Update
TODO.md to track the remaining NetWare AFP implementation work on top of the
new backend hook.
This adds build-time integration and local metadata helpers only; it does not
change AFP protocol behavior.
Expose the existing experimental Packet Burst code through a CMake option.
Generate ENABLE_BURSTMODE in config.h from -DENABLE_BURSTMODE instead of
keeping it hard-coded to 0, and print the selected state during configuration.
Also fix the existing nwconn burst dispatch conditional so the source compiles
when ENABLE_BURSTMODE is enabled.
This only makes the existing Packet Burst code build-selectable; it does not
change the default behavior, which remains disabled.
