Enabled hacker color terminal.
Renamed screen.c to vga.c which makes more sense
Disabling paging for now, need to implement some actual bootmemory allocator
instead of the abomination of kmalloc() that currently exists.

Also need to mark kernel pages appropriately. Will probably just designate the
first 1MB of memory as NULL pages since we load the kernel at the 1MB boundary
anyway (at least for now).