Comestibles pack.

1. Sewer brew + recipe.
2. Sewagas + recipe.
3. Stimgas
4. Fancy hobo + recipe.
5. Kalimotxo + recipe.
6. Bee's knees + recipe.
7. Whiskey sour + recipe.
8. Coffee milk + recipe.
9. Milk tea + recipe.
10. Bark tea + recipe.
11. Grilled cheese sandwich + recipe.
12. Cheese sandwich + recipe.
13. Jam sandwich + recipe.
14. Boring sandwich + recipe.
15. Wastebread + recipe.
16. Honeygold brew + recipe.
17. Honeyball.
Fix quote.
Fix.
Rename get_invlet_for_item() to find_usable_cached_invlet().
Adds survivor mess kit.

Functions as a mess kit but with full cook-pot functionality.

Bigger and heavier than the other mess kits, it runs on common lamp oil
and is auto-learn at fabrication level four.

Can rarely spawn in survivor zombie loot, otherwise craft-only.
Fix use_action and grammar.
Remember manually-assigned invlets, and use them preferentially.
Colour assigned invlets yellow in inventory screen.
Allow toggling of manual invlet assignment.
Bright red in stead of dark red for debugmsg().
Fix attempt.
Don't overwrite existing invlet assignment for newer pickup.
Merge branch 'letrz' of https://github.com/yobbobanana/Cataclysm-DDA into merge4
Merge branch 'brightbug' of https://github.com/yobbobanana/Cataclysm-DDA into merge4
Merge branch 'messkit' of https://github.com/Rivet-the-Zombie/Cataclysm-DDA into merge4
Merge branch 'comestibles' of https://github.com/Darkyhard/Cataclysm-DDA into merge4
Fix JSON.