gracefully handle crashes of a user mode programm

fix interrupts occuring while in user mode

rename service proivder to service function ...

now matches the documentation in the wiki

free stack of unused system call processes ...

saves about 1/2 of previously used memory

add kernel events ...

kernel events get triggered by the kernel when certain things happen.
first example: log a message whenever a new programm is loaded from the initrd

add source service names to log messages

add an additional argument to request calls

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

use saved strings for service interaction system calls

add discard string system call

add read string syscall

add stringmap insert and read length functions

mov syscall handlers to different files

seperate log into log file and a parallel driver

add events

add a static libary and fix interrupts

minor code cleanup regarding loading ELF files and running the main function

print a message when a key is pressed

enable subscribing to an interrupt and set up the PIC

end tasks when they trigger an exception

enable interrupts

enable freeing of memory

add passing data to a syscall

use registers for passing data to system calls

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