Fixed 'escaping the escape' xss technique false positives

[liquidsec]

Fixes #2172, adds Javascript quote context detection function, adds tests for all new functionality and existing 'escape the escape' quote technique within lightfuzz xss submodule.

[codecov]

Codecov Report

Attention: Patch coverage is 98.07692% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (2a73f4d) to head (c8a81af).
Report is 46 commits behind head on lightfuzz.

Files with missing lines	Patch %	Lines
bbot/modules/lightfuzz_submodules/xss.py	95%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           lightfuzz   #2173   +/-   ##
=========================================
+ Coverage         93%     93%   +1%     
=========================================
  Files            386     388    +2     
  Lines          31450   31532   +82     
=========================================
+ Hits           29042   29127   +85     
+ Misses          2408    2405    -3     

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