Allow key bindings to use arguments for commands

[rioj7]

The toggle commands do not use the arguments set in a key binding.

  {
    "key": "ctrl+i t",
    "command": "settings-toggle.toggle-workspace",
    "args": {
      "action": "set",
      "setting": "workbench.colorTheme",
      "value": "Default Light+"
    }
  }

Possible values for action:

• toggle : toggle the current value
• set : set the settings to the value given in property value (string, boolean, number, array, object)
• reset or default : revert to default value
• ....... : something I didn't think of

[z0al]

Great suggestion @rioj7 . I was not aware it's possible to pass args to commands when defining keybindings.

This shouldn't be hard to implement but I'm quite busy these days so won't be able to tackle it soon. If you want to open a PR by all means go ahead, I'd appreciate it.