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.

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