Tweak venom, 80x256mm FC explosion, kobold patch

[N7Huntsman]

Changes

• 80mm FC cookoff starts at 1/3 HP, instead of 1/10.
• 80mm FC cookoff wick increased
• Arrows now have venom as a secondary damage, with arrow primary.
• Venom Bite/Scratch now harm outside layer only.
  -Royalty: Removed linked part of venom talon so it no longer logs as "human blade"
• [O21] Kobolds: Decreased carry weight/bulk, removed outdated head scaling patch.

References

• Helps/temporary fix for Venom Arrows // Snake Farms #1140 until future possible feature rework.

Reasoning

• 80 FC cookoff could stand to start a little sooner, after my initial nerf.
• Venom arrows were too strong as primary damage, setting them to a weaker secondary damage helps reduce the lethality of the venom aspect without completely nerfing the arrow. It now acts more as a damage enhancement to a regular arrow.
• Stronger melee attacks that used venom (such as the new Royalty implants) could over penetrate and apply double venom damage, which added up to kill extremely quickly. Setting it to harm outside layers only prevents this, but may not be the optimal long-term solution.