Release 2.40.0

18 new icons:

• brand-google-filled
• brand-printables
• brand-thingiverse
• calendar-sad
• calendar-smile
• calendar-user
• category-minus
• category-plus
• file-neutral
• file-sad
• file-smile
• metronome
• stack-back
• stack-backward
• stack-forward
• stack-front
• stack-middle
• tools-kitchen-3

Fixed icons: brand-google