Damage animation is done by the client and not by the server

When hitting a player in a multiplayer server with the hurt animation should be sent by the server as an entity event packet, as it was in the previous versions.
The bug also applies for our own player, as it does the damage animation when jumping off a cliff or whilst falling out of the world (even if the server doesn't notify that).

Even if this isn't a bug, it's a really annoying, confising and useless feature.

How to reproduce:

• Join a 0.15 server
• Punch a player or fall from an high place