[VMM] vmm_free implementation part 1

[TARFS] Step 1: the tar fs should be loaded as grub module

[MISC] Implement mem* function

[EXECUTABLES] Check why executables are running only on 4k pages

Add Function to retrieve a physical address given a virtual one

Device drivers basic struct and initialization

Possible error in ioapic.c

[EXECUTABLES] Parse elf and get information on memory to allocate

[FRAMEBUFFER] Can its initialization use the HHDM instead of manual allocation?

[FRAMEBUFFER] Clean screen at boot