add printf.c and scanf.c
[libc]new style ctype
[libc]remove load and save environment functions
[libc]fix environ
[libc]fix errno
[libc]new style exit library
[libc]fix assert, change DEBUG to NDEBUG
working on new console framework
comment menu mode
new version readline
working on new console
working on new console...
working on new console
working on new console
working on new console
working on new console
add console input support
[lua]remove lua and luac command
change readline's directory
[printk]remove printk functions