Load Binary Files

[chorman0773]

Setup code to load userspace binary files

• Setup the code needed to parse ELF files
• Load ELF interpreter from the INTERP segment
• Setup user entry-point frame format.
• Setup execution procedure for userspace programs
  • Add exec system call
  • Setup CPL=3 code
  • Jump to the CPL=3
• Add support for #! script files