Attack Defend Variant: Dynamic Reinforcement Strength

[CWolfs]

Idea by vidarion from Discord.

Make Attack/Defend reinforcements show up based on the remaining strength of the base in one of two ways: Mode 1: destroying an enemy base building delays reinforcements by 1 round; Made 2: destroying enemy base building speeds up reinforcements by 1 round; Mode 3: destroying base buildings doesn't change reinforcement delay (mode would be set by contract)