Add basic VFS functions/types
Move make_config_files.sh into tools/
Add simple initrd generating program
initrd file format consists of one byte indicating the actual number of
files in the initrd, followed by MAX_FILES File_header structs, each of
which has a name (char[MAX_NAME_LENGTH]), a size, and a pointer to the
start of its file data relative to the start of the initrd.
These are followed by the actual file data.