[suggestion] Add dropdown lists and checkboxes on savers options

[jmfergeau]

For now, you can only use text fields and sliders to set custom options for savers. It would be great to add dropdown lists and checkboxes on the savers options too.

something like this :

"options":[
    {
      "name": "Dropdown option",
      "type": "dropdown",
      "description": "Choose something in the list",
      "dropdownEntries": [
          "An entry",
          "Another one",
          "And another one..."
      ],
      "default": "An entry"
    }
  ]

Or for dropdownEntries, maybe something bigger for more control like :

"dropdownEntries": {
    "An entry": "firstoption",
    "Another one": "secondoption",
    "And another one...": "thirdoption"
    },

And for checkboxes, something like :

"options":[
    {
      "name": "checkbox option",
      "type": "checkbox",
      "description": "Will do something if checked",
      "default": "false"
    }
  ]

I unno, it's suggestions, feel free to inspire ^^