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/ents_prev.comp

@@ -12,5 +12,5 @@ layout(std430, set = 0, binding = 39) buffer EntPrevW { vec4 prevw[]; };
 void main() {
     uint i = gl_GlobalInvocationID.x;
     if (i >= uint(ctrl.inp.w)) return;
-    prevw[i] = vec4(ents[i].a.xy, 0.0, 0.0);
+    prevw[i] = ents[i].a; // rigid bodies also need their previous angle
 }