Add subwords capability to ffuf_shortnames

[liquidsec]

Also adds ignore_case option to ffuf (useful for IIS where case doesn't matter)

Subwords uses python nltk (natural language toolkit) to try and find smaller words at the beginning of shortnames. If it does, it sends the remainder off to the predictor. This works well because web developers have a habit of making lots of "VerbAction" type two-word file names.

[codecov]

Codecov Report

Attention: Patch coverage is 95.34884% with 4 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (703a313) to head (64b201b).
Report is 4 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/modules/deadly/ffuf.py	75%	2 Missing ⚠️
bbot/modules/ffuf_shortnames.py	97%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2237   +/-   ##
=====================================
- Coverage     93%     93%   -0%     
=====================================
  Files        378     378           
  Lines      29363   29432   +69     
=====================================
+ Hits       27155   27203   +48     
- Misses      2208    2229   +21     

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