Send multiple keys

[iberianpig]

Added support for sending multiple keys in an array format using sendkey.

• It is now possible to specify multiple keys with array style.
  • $ fusuma-sendkey ["LEFTSHIFT+F10", "T", "ENTER", "ESC"].
• Following example is customize for key combinations in ~/.config/fusuma/config.yml.

# example
hold:
  3:
    sendkey: [LEFTSHIFT+F10, T, ENTER, ESC] # Translates page in Google Chrome

Closes: #6,#31