kernel await / fire event: add code to wait for specific event

stdio: add negative sigh for printing negative numbers

usb: hlib: use "unsafe" direct event calls to work without strings

fix weird problems with getPhysicalAddress system call

fix issue with printing where the first message would not get printed

use sleep function for xhci driver waiting for the controller to start

add sleep function to PIT driver

try initializing xhci hub

add system call to retrieve the physical location of a virutal address

add lspci user programm

prevent bad behaviour when loading a service that has already been loaded

move 'gets'-functionality to ioManager to simplify the shell source code

add await syscall

check if a message should be printed to the main vga screen by checking if any syscall in the 'syscall stack' is the foreground process

pass keyboard input to shell

route the shell service to the vga output

rewrite general IO using an IO-manager

parse ps2 key codes

add system call to look up the names of functions

rename service proivder to service function ...

now matches the documentation in the wiki

add formating print function

make malloc functions accessible to user mode programs

fix compile flags to prevent errors

add system call to request memory ...

print hi to vga screen

reorganize hlib source code

use string identifiers for events ...

(some rework of the string saving system was required)

use stringmap for communication between processes

use saved strings for service interaction system calls

add discard string system call

add read string syscall