Lot of bugfixes

* Adding clipper to generate the terrain's negative powder-contour offset.
* Fixing RDB issues (fracture, active trigger, performances)
* Fixing blood emission
* Fixing the freezing formula on liquids
* Fixing Steve spawning due to a missed test.
* Reaction table properly build

shaders/fx_host.glsl

@@ -4,4 +4,6 @@ layout(std430, set = 0, binding = 35) buffer FxHost {
     vec4 hcast[1024];      // 2 lists x 256 requests x 2 vec4: (x, y, dir x, dir y), (node or -boom-1, team, seed, flags)
     vec4 hnodes[8192];     // 2048 nodes x 4 vec4
     ivec4 hspecs[16384];   // 4096 specs x 4 ivec4
+    ivec4 hcollision;     // x: compact collision target count, rebuilt on the GPU before flight
+    int htargets[4096];   // ascending entity slots; preserves first-hit ordering
 };