Add Battle priorities to the set-up

Background: 

In a recent game with the Horatio I encountered a rather enoying situation during a battle. It included a hero ship and an upgraded Weapon on my side, against 4 smaller pirate ships (can't remember the class name, but they have all barely attack strength) and 1 pirate frigatte, which is significantly stronger. I won the battle, but lost the Weapon, which took a while to build and the loss was very unpleasent for the early game I was in.

Problem:

So you might wonder now what the problem is... Well, during the observation of the battle I quickly realised that I would not have needed to lose the Weapon. There were two instances that lead to the destruction of it:

1. The enemy ships concentrated fire on the Weapon (about 700HP) instead of the Hero ship (about 1800HP)

2. My ships spread their fire between the enemy frigatte and the smaller ships.

This resulted in the destruction of my Weapon by the Frigatte shortly before the Frigatte itself was destroyed. This could have been avoided if the hero ship would have drawn the fire or my ships would both have focused the enemy frigatte and destroyed it just a few seconds earlier.

Solution:

1. One way would be to add a priority choice in the battle set-up. If I remember it right there was something like this already in Endless Space. This would include things like:

- shooting the highest/lowest health ships first

- shooting the highest attack ships first

- and others (if you got more ideas)

Of course I am aware that there is already coming some sort of priority system with the ship roles (Guardian etc.). These would still become attention first. 

2. The other way would be to add a module that gives ships the opportunity to draw fire, but I think that is a less viable option and would only really apply to early game, when you don't have all classes available yet.

I have a forum post that goes in little more detail if you want to check it out. You can find it here:

https://www.games2gether.com/endless-space-2/forum/66-game-design/thread/24070-priority-system-for-better-control-in-battles

Kangarombi