Value for no poison is Integer.MAX_VALUE, not 0. add .poison proxy record field

[Veracity0]

Monsters with poison have a poison level from 1 to 6.
The lower the level, the more severe.
The value for "no poison" is Integer.MAX_VALUE, not 0.

Added $location.poison proxy record field, which is the most virulent poison a monster in that area has.

This is the issue for the following Bug Report:

https://kolmafia.us/threads/mafia-will-not-adventure-without-acquiring-an-anti-anti-antidote.27628/

[codecov]

Codecov Report

Merging #810 (688b2b5) into main (d3810d1) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##               main     #810      +/-   ##
============================================
- Coverage     25.12%   25.12%   -0.01%     
  Complexity    11379    11379              
============================================
  Files          1017     1017              
  Lines        159276   159281       +5     
  Branches      35034    35036       +2     
============================================
+ Hits          40012    40013       +1     
- Misses       111847   111851       +4     
  Partials       7417     7417              

Impacted Files	Coverage Δ
...ge/kolmafia/textui/parsetree/ProxyRecordValue.java	33.08% <20.00%> (-0.10%)	⬇️
src/net/sourceforge/kolmafia/MonsterData.java	48.39% <100.00%> (ø)

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