Java Edition 1.11-pre1

1.11-pre1 is the first pre-release for 1.11.

Blocks

 * Observer Blocks
 * Changed front (detecting side) texture to be an 'observing face'.
 * Same texture is used for facing up and down, although facing down: points with the top of the face towards north, and when facing up: points with the top of the face towards south.
 * Texture was made by Tommasso Checchi (@_tomcc)
 * Redstone output side now blinks when it outputs power.

Items

 * Enchanted Books
 * Curse of Vanishing, Unbreaking (III) and Mending now appear in the tools as well as the combat Creative Tab.