Dynamic Withdraw: Improve positioning of EZ

[CWolfs]

When using Dynamic Withdraw, often the zone isn't in a great position for the player.

Improve this by:

• Not taking into all enemies, but only enemies within X range / detected range when influencing the EZ position
• Improving positioning to not put the EZ behind the enemy lances (not always possible but see if I can improve it)
• Tweak position min / max distance