Hidden icon sets

[Vjacheslav Trushkin]

It appears Mono Icons were added twice: in mi.json and mono-icons.json: iconify/icon-sets#21

To fix that issue, I've added hidden boolean property to IconifyInfo type (types and info conversion function in utils have been updated as well) and latest version of @iconify/json package contains hidden property for mono-icons:

	"mono-icons": {
		"name": "Mono Icons",
		"total": 180,
		"author": "Mono",
		"url": "https://github.com/mono-company/mono-icons",
		"license": "MIT",
		"licenseURL": "https://github.com/mono-company/mono-icons/blob/master/LICENSE.md",
		"height": 24,
		"samples": [
			"user",
			"log-in",
			"play"
		],
		"version": "1.3.1",
		"palette": "Colorless",
		"category": "General",
		"hidden": true
	},

So icon set is still there to avoid breaking people's UI, but it is hidden so it no longer should appear in icon sets list.

[Anthony Fu]

Implemented.