Shared tomatoes, P1 sandbox spawns, and weapons left out

- Tomato splats are kept in the match, so everyone sees everyone's
  (others' arrive in replays, which play no effects), each splatting
  with juice and a sound once.
- The sandbox's first player (solo or hosting) spawns on the arena's
  P1 mark.
- A thrown flail ball or grapple stays out when switching weapons, and
  another weapon fires while a grapple hangs on. Mines, flail balls and
  grapples go once their slot no longer holds the weapon that put them
  out (mines fizzling).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/effects.h

@@ -58,18 +58,6 @@ struct Ring
     float radius = 0;
 };
 
-constexpr int SPLAT_BLOBS = 6;
-
-// A tomato's splat: blobs of colour round where it landed, fading out.
-struct Splat
-{
-    Color color;
-    Vec2 position;
-    Vec2 blobs[SPLAT_BLOBS];
-    float sizes[SPLAT_BLOBS];
-    float life = 0;
-};
-
 // A fading copy of a sprite left behind by something moving fast.
 struct Afterimage
 {
@@ -85,7 +73,6 @@ public:
     void afterimage_spawn(Pose pose);
     void flash_spawn(Vec2 position, float angle, float size, Color color);
     void ring_spawn(Vec2 position, float radius, Color color);
-    void splat_spawn(Vec2 position, Color color);
     void afterimage_draw(Game& game);
     void number_spawn(Vec2 position, int value, int target, Color color);
     void dps_record(int amount);
@@ -104,7 +91,6 @@ private:
     std::vector<Particle> particles;
     std::vector<Popup> popups;
     std::vector<Ring> rings;
-    std::vector<Splat> splats;
     float shake = 0;
     int ticks = 0;
 };