Use system-dependent int type for file handles
Initial port of id_ca.c, using similar work done for Catacomb 3D
Actually swap _seg for id0_seg (again just for documentation for now)
id_in.c (again based on Catacomb 3D porting)
A few more missed type swaps...
Converted newlines to LF, updated id_rf.c, id_mm.c and id_mm.h (based on work on Cat3D)
Very beginning of id_sd porting; Ported ASM code in kd_keen.c, kd_play.c