[REFACTOR] Moved bootmain.c into xng
[REFACTOR] Moved stat.h in include and main.c in xng
[REFACTOR] Moved vm.c into xng
[REFACTOR] Moved timer.c into xng
[REFACTOR] Moved bio.c, exec.c and console.c into xng.
[REFACTOR] Moved ide.c, ioapic.c and kalloc.c into xng
[REFACTOR] Moved lapic.c, log.c, pipe.c and proc.c into xng
[REFACTOR] Moved string.c and swtch.S in xng, and modified the makefile to output the perl's script file into xng
[REFACTOR] Moved trap.c and trapasm.S into xng
[REFACTOR] Moved uart.c into xng
[REFACTOR] Moved sysproc.c into xng
[REFACTOR] Moved sysfile.c into xng
[REFACTOR] Moved syscall.h into include and syscall.c into xng.

This marks a checkpoint, where all the kernel files are inside
the xng folder.