Detonance Core: Dynamic Shockwave Physics

# Detonance Core 0.3.0-pre.3

This beta focuses on long-range effects, heavier collapse motion, and a complete audio redesign.

## Highlights

- Distant smoke, collapse dust, and sand haze remain visible well beyond the vanilla particle cutoff.
- Sand blasts produce a separate persistent beige dust cloud.
- Falling structures release progressively and react to material mass.
- Collapse camera motion is separated from explosion trauma.
- Rebuilt pressure crack, blast body, rumble, debris, impacts, echoes, tinnitus, and aftermath audio.
- Added the networked sand-material flag for consistent multiplayer visuals.
- Removed doubled vanilla explosion sprites and vanilla boom from Detonance Core blasts while keeping a fallback for unmatched explosions.

Structural collapse remains disabled by default. Enable it with `/detonance collapse on` or in the server config.

This is a beta build. Back up important worlds before enabling structural collapse.