Make Ctrl+C=copy and Ctrl+Shift+C=interrupt in VSCode terminal

With Visual Studio Code 1.28.0 there is a command, workbench.action.terminal.sendSequence, to send arbitrary keypresses to the terminal. See Send text from a keybinding to the terminal.

  {
    "key": "ctrl+shift+c",
    "command": "workbench.action.terminal.sendSequence",
    "args": {
      "text": "\u0003"
    },
    "when": "terminalFocus"
  }