Fix: Redirect output did not truncate existing file.(#27)
import_c.go moved because it required from conio package
built-in mkdir/rmdir
create built-in command: del,erase
rmdir: remove duplicate of wildcard expansion
built-in del: modify prompt and message
built-in mkdir/rmdir
create built-in command: del,erase
rmdir: remove duplicate of wildcard expansion
rewrite conio.Getch() and conio.DisableCtrlC() with goroutine
prepare code for new onclose event, but comment out