- Assign battle sounds to each unit type (gunfire, tank, cannon, missile, etc.)
and play the appropriate sound on attack/counterattack in battle animations
- Add per-unit-type movement sounds (march for infantry/mech, engine-fast,
engine-heavy) that loop during move animations and stop cleanly on completion
- Play jump sound during capture animation hops and activation sound on capture
- Play explosion sound when units are defeated in combat or crash
- Lighten unit tint relative to buildings so units remain visually distinct
when standing on captured buildings
- Add new audio assets: battle sounds, march, 8bit-jump, and update battle-tank
