Add to editor-toolbar to show non-printable-characters

### Description

So add to edit-toolbar by default a icon/button to enable/disable showing non-printable characters so View -> Show non-printable characters.

### Use case/motivation

Be more close to editor so even for quick check that correct characters are there.

### Related issues

_No response_

### Are you willing to submit a pull request?

No

Start by tracing the existing View → Show non-printable characters action in the NetBeans editor and its current menu behavior. Then inspect the editor toolbar configuration to determine where the toggle belongs; done means the control is present by default and provides the same enable/disable behavior as the menu action.

Written by the indexing model from the issue text.