✨Add 2 new features, Group commands, StatusBarItem

• Add 2 new features
  • Group commands
    • Related: #28, #31
    • See also: group section https://github.com/SeeLog/commando#commands-settings
  • StatusBarItem
    • Related: #29, #30
    • Default is false, since status bar's area is limited

✨Add log on start running

Add log for output channel on start running like "Commando start.".

🐛Fix create output channel repeatedly

Related #22

Fix output channel creation every time runs any command.

🎉 FIRST RELEASE 🎉

🎉 First release of Commando 🎉