SF2000 Multicore Alpha 0.01

• updated gpSP core (previous version didn't work)
• updated Fuse .opt file (better button assignment, system type 128k)
• updated readme with mancy changes including:
  • version number added (original is "prerelease", no version number)
  • section headers
  • added bootloader fix reminder
  • added warning that original firmware GBA list NO LONGER WORKS
  • adding compatibility warning
  • added mention of using hidden files for stub file creation
  • added information links to bios section
  • added opt file section
  • added link to spreadsheet