Makefile: update recipes
gtd.h: add protected mode function; fix typo
gdt.c: add enter_protected_mode

Add first instance of inline assembly in this iteration of the kernel
kabort.c: add clear interrupts before loop
kabort.c:add hlt instruction at end of panic
Makefile: add gdt to kernel recipe
gdt.c gdt.h: major rewrite of gdt system
kernel.c: add gdt to kernel
Updating Compiling instructions--will finish later
Finalized version of docs
Finalized version of docs