Email

Adds email sending ("/email send" with a book in your hand)

PLEASE TELL ME IF IT WORKS OR DOES NOT WORK. I WANT TO MAKE SURE IT WORKS FOR EVERYONE. FEEDBACK IS APPRECIATED. :D

Email sending only works for GMAIL and HOTMAIL (I'm working on adding support for more, tell me what you want!)

JAR is quite large (relatively) due to shading in dependencies (I don't think I can do anything about that though...)