Monterail Full Dark, a Thunderbird theme inspired by the mockup of Monterail
Fix font loading and wrong "y" rendering Some minor fixes to icons color and address book
Fixes conema/monterail-dark#50 #53 (calendar & tasks text color) conema/monterail-dark#39 (sent icon not shown) conema/monterail-dark#54 (font update, unread mail font weight) #57 (horizontal lines in calendar)
Options page to change the message list height and the folder tree height.
Compatibility with Thunderbird 78.x