feat: item drops

[midgleyc]

Various PFC spading.

For the drunken rat king, I put the whiskers at 100% from Wildfire testing assuming that only 100% drops didn't burn, but quest items don't burn either, so this was just wrong. Tested again at -100% drop.

[codecov]

Codecov Report

Merging #1873 (9f8ef5c) into main (4d96573) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1873      +/-   ##
============================================
- Coverage     36.37%   36.36%   -0.01%     
+ Complexity    18782    18780       -2     
============================================
  Files          1081     1081              
  Lines        166364   166364              
  Branches      35399    35399              
============================================
- Hits          60507    60506       -1     
  Misses        95973    95973              
- Partials       9884     9885       +1     

see 3 files with indirect coverage changes

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