Implement missing vanilla UI "switcher"

[its-vezdehod]

Introduction

Right now, there are only "simple" and custom form switchers.

Unimplemented stuff

• Chests (classic-ui, pocket-ui, shared-ui?)
• Furnaces (classic-ui, pocket-ui, shared-ui?)
• Anvils (classic-ui, pocket-ui, shared-ui?)
• Enchanting tables (classic-ui, pocket-ui, shared-ui?)
• Notification hud (such as titles, tips, actionbars, toasts, etc...)
• Hud elements (health-bar, hunger-bar, custom elements, hotbar, etc...)
• Death-screen
• ...