[Feature Request] Add the option to not show icons

[Theigrams]

My json configuration file is as follows.

"wrap-math-equation": {
    "label": "Wrap with math equation",
    "binding": "ctrl+m",
    "template": " $$^$ "
  },
"wrap-math-block": {
  "label": "Wrap with math block",
  "binding": "ctrl+shift+m",
  "template": "$$\n$^\n$$"
  }

However, the default icon displayed is "X", can we add an option in the json to control whether to display this icon or not ?

[sethyuan]

Feature implemented, please have a try. The current behavior is if you don't configure an icon, it will not be displayed in the toolbar.

[Theigrams]

It works nice, thanks a lot!