Protect meta key
Print notice when no registered icon types found
Settings meta box
Implement settings reset
Don't load non-active icon type style
Implement Extra stylesheet from settings

This removes menu_icons_load_extra_style filter
Implement default position setting
Fix custom walker filter
PHPDoc & PHPCS fixes
Update Form Fields

* Streamline 'keys'
* Add new types: number, url, color, date
* Support inline description (using <span /> instead of <p />)
Helper: Introduce kucrut_validate()
Plugin & Menu settings in-a-box
Fix typo in settings messages
Fix input style on media frame sidebar
Update Form Fields
Form Fields: Simplify class properties
Form Fields: Add 'hidden' field type
Delete icon link cosmetic
Menu settings
Add menuSettings to JS vars