Improvements for custom buttons tool (editor)

[aia]

Currently we can create via ACP new buttons for editor only with one option, which always set as textfield (ACP > Editor > Add Button > Custom).

I suggest to make some little, but very useful improvements for this tool:

1. Ability to add any number of options.
2. Ability to choose type of option field (now it's always textfield). It would be great to be able to choose between text, radiobuttons & checkboxes with predefined values, colorpicker, datepicker, coordinates, address, etc.

It's very easy to implement but it will greatly increase the usefulness of this part of editor settings.

Please let me know if you need more detail on this.

[aia]

Hope we'll see it in 4.3.