string: added startswith/endswith methods, fixed strip() to remove all whitespace (not just spaces), and fixed some logic bugs
vfs: clean up Symlink a little
fat: symlinks for FAT
x64: turn certain traps into subsystem exceptions (for POSIX, this means signals), instead of breaking into the debugger
posix: make SIGBUS an EXITMSG signal as well. SIGBUS is sent on GPF on x86 targets.