Spread control: client-seed no-spread

HL2's CBaseEntity::FireBullets seeds its RNG from the usercmd random_seed
(m_bUseServerRandomSeed is false for HL2 weapons), so the client can select the
8-bit seed that puts CShotManipulator::ApplySpread closest to the center.

- New feature Spread control -> Active / No spread (both default on).
- Precompute the best seed for a single shot and for the shotgun's 8-shot
  primary (first pellet accurate) and 12-shot secondary windows using the
  engine's own RandomSeed/RandomFloat from libvstdlib.
- Set cmd->random_seed on attack commands; note_modified repairs the CRC.
- The random cone offset is neutralized, but the cone size, the pistol
  accuracy penalty, server view punch and any damage falloff remain
  server-side; stock HL2 has no distance damage falloff.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/hl2h.cpp b/src/hl2h.cpp
index ee2e990..dddcbdc 100644
--- a/src/hl2h.cpp
+++ b/src/hl2h.cpp
@@ -532,6 +532,9 @@ static void do_move(int seq, float frametime) {
         note_modified(cmd, flags, vel);
     }
   }
+
+  if (spread_control_apply(cmd, ent))
+    note_modified(cmd, flags, vel);
 }
 
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