Imports of mc command

PathSynopsis
github.com/creack/pty
github.com/kr/text/colwriterPackage colwriter provides a write filter that formats input lines in multiple columns.
ioPackage io provides basic interfaces to I/O primitives.
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
strconvPackage strconv implements conversions to and from string representations of basic data types.