Addressing some feedback

We added one skill per survivor characteristic that the player has control over during battles.
* Well-rounded survivors (reliability and toughness differ no more than 1) can make all expedition members heal a little and cause their next attack to stun.
* Reliable survivors can make all expedition members crit with as much damage as itself (which should almost always be a good thing)
* Tough survivors can taunt all enemies.
This will hopefully bring a little more excitement to the player during the battles.

We have also added some interesting trinkets that can be found. Some of them affect the way a survivor searches for his target, which could be weakest enemy, enemy farthest away or enemy with most damage. 

Some UI improvements have been added too, like the survivor following the pointer when moving them around on the battlefield.