Refactor actions' arguments

[blocknotes]

⚠️ Breaking changes ⚠️

• actions arguments now must be placed in args key
  • example data: { if: "checked", then: "addClass", args: "red", target: "#something" }
• callbacks functions now must be placed in callback key, optionally with arguments in args key
  • example data: { if: "checked", then: "callback", callback: "setTitle", args: "Some title" }