Revision 480

- Fix small syntax error in reset16.lds
- small bug fixes to the elf bootloader
- factor the elf bootloader into focused smal subroutines that are easier to comprehend
  and maintain
- Implement support for PT_NOTE headers and parsing ELF notes if we need special functionality
  An ELF Image should never need an ELF loader to interpret an ELF to work correctly, making
  interpretation of all ELF notes optional.
- Implement support for notes giving PROGRAM_NAME, PROGRAM_VERSION, and PROGRAM_CHECKSUM