New Nav system

Today i started to build new nav system. 

The goal is to be able to being eaten by titans.

I started to make animations looks better:

• now feet follow more accurately the ground
• at creation, titan play random idle animation
• fixed wrong head rotation when titan look the player

When the player in near to the ground level, stomp animation still occur (only for bigger titans) but when it's in mid-air , the titan will try to grab it.