Working context switching but far from stable. Changes needed to be made
to the internals of cosmos to include mutex's in vital components (Heap,
Thread Manager, ect). Context switching currently only switches the
general registers and does not switch the MMX context, however this will
be added in the future. Also when a thread currently dies it takes the
whole system down, patches to the IDT handlers needed to be made to
prevent system lockup in the future
