Added Program Manager, System Programs, others

Program Manager is the "Task Manager" of JavOS. It holds the list of
active programs.
System Programs are persistent programs that will never get shut down.
Examples would be the console or the Desktop window manager.
ProgramManagerUI is a SystemProgram that displays a list of the programs
currently running by accessing a String list of the active programs and
displaying them as text.
- There are currently problems with the Program Manager and how it
communicates with its parent class BrainOS, because an ArrayList is lost
in translation at some point.