Import updates to WYSIWYG menu

Adds font-color and a variety of minor fixes
Style for [data-delete], blockquote, .resizeable, & [contenteditable=true]:empty
Submodule classes/core 34e5b24..894ba1a:

> New method email::asHtml()
New form for composing emails

For use with \core\email
Handler for email form

Send an email and notify of send success/failure
Darken envelope icon
Darken all other envelope icons
Renamed email form to compose_email
Handler to load compose_email form
Add a menuitem to laod compose_email form