adds hidden attribute to buttons, and copy type button

[Liimurr]

New Optional Button Argument: "Hidden"

brief

Creates hidden buttons so that you can use inline buttons without cluttering the note with main button in arbitrary locations.

use case

zotero integration plugin which overwrites the same note every time you sync with zotero, but there is no easy way to make a separate meta file to hold custom buttons per annotation.

New Button Type: "Copy"

brief

Copies to clipboard & does not rely on templater

use case

• When using templater with zotero integration plugin, the auto generation of the zotero file will trigger the templater commands and remove them from the buttons.
• When using Copy this does not happen.

```button
hidden true
name 📋
type copy
action some text to copy to clipboard
```

Example