ToER update 2019.1.3

ToER 2019.1.3 update includes:

1. Units should now follow terrain more precisely. Units won't sink into the ground or walk in the air while passing near cliffs. 
2. When building the building on the top of units, units will now walk away rather than being quickly pushed.
3. Improved handling of walk and idle animations.
4. Units will face movement direction and should play walk animation when being pushed by other units.