Simplify ship movement

**What do you want to see?**
Instead of a roguelike style time based movement system, we can use something akin to the current combat movement system: ships move (using all their movement points at once) in ascending order of speed, and once all ships have moved then combats will trigger if ships are in the same sector as enemies.

**How would it help players?**
Dramatically speed up turn processing.

**Alternatives**
N/A

**Screenshots and mockups**
N/A

**Things to consider**
Could run into issues with obscuring storms - slow ship ducks into storm where fast ship can't see it, fast ship can't catch it. Perhaps use a SE2 style cloaking model where ships are always visible at zero range? But that would prevent blockade running at warp points... Or give the fast ship temporary sight of the ship as it ducked into the storm since it was theoretically in pursuit the whole time?