Refactor: inline ip extractor

[DanVanAtta]

Usage is now very minimal, can simply inline the utility 'ip extractor'.
Request objects have both IP and hostname, some care needs to be taken
to get the right value.

Functional Changes

[] New map or map update
[] New Feature
[] Feature update or enhancement
[] Feature Removal
[x] Code Cleanup or refactor
[] Configuration Change
[] Bug fix:
[] Other:

Testing

[x] No manual testing done
[] Manually tested

[codecov-io]

Codecov Report

Merging #5338 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #5338      +/-   ##
============================================
- Coverage     24.18%   24.17%   -0.01%     
+ Complexity     6756     6754       -2     
============================================
  Files          1013     1012       -1     
  Lines         77228    77227       -1     
  Branches      11496    11496              
============================================
- Hits          18675    18673       -2     
- Misses        56420    56421       +1     
  Partials       2133     2133

Impacted Files	Coverage Δ	Complexity Δ
.../server/error/reporting/ErrorReportController.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../src/main/java/games/strategy/net/nio/Decoder.java	65.51% <0%> (-1.73%)	11% <0%> (-1%)

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