Revert "Vorgabe Aufgabe2"

This reverts commit 317daaf424b5edc0cce736e12aab0bcc829fda3c.

Conflicts:
	device/keyboard.cc
	device/keyboard.h
	device/panic.cc
	device/panic.h
	guard/gate.h
	machine/ioapic.cc
	machine/ioapic.h
	machine/ioapic_registers.h
	machine/plugbox.cc
	machine/plugbox.h
	machine/spinlock.h
Added comments from ex1 correction