xhci refactoring: sperate out all xhci-related code to its own directory

make printf function available for not-main userland files

xhci: refactor and seperate out commands

fix weird problems with getPhysicalAddress system call

fix problem where page fault happens because not the whole string is mapped in a insertString system call

refactor syscall.c

print basic XHCI information

add lspci user programm

free stack of unused system call processes ...

saves about 1/2 of previously used memory

add formating print function

make malloc functions accessible to user mode programs

add system call to request memory ...

print hi to vga screen

move memset to memutil

use string identifiers for events ...

(some rework of the string saving system was required)

use stringmap for communication between processes

add stringmap insert and read length functions

enable freeing of memory

use registers for passing data to system calls

add the ability to create multiple services and repair inter-service communication

organize services and their providers

enter usermode for user processes and start with some memory protection

read elf data into a new page table

read the initrd file to get the memory location of the first userspace program

find the initrd in the multiboot 2 information structure

add basic kernel page management

initial commit