Alot of code is shared between i386/i686/x86 and x86_64
and a lot probably will be used for compatability modes.
So we start by moving the headers into one Directory.
We will probalby be able to move some cpp files aswell.
The IRQController object is RefCounted, and is shared between the
InterruptManagement class & IRQ handlers' classes.
IRQHandler, SharedIRQHandler & SpuriousInterruptHandler classes
use a responsible IRQ controller directly instead of calling
InterruptManagement for disable(), enable() or eoi().
Also, the initialization process of InterruptManagement is
simplified, so it doesn't rely on an ACPI parser to be initialized.