Better engine debugging, misc bugfixes

[TheTechromancer]

Fixes:

• Engine Occasionally Hangs #1616
• ffuf doesn't respect global proxy #1685
• ASN is making unnecessary requests #1688
• Memory Bug #1615

[codecov]

Codecov Report

Attention: Patch coverage is 89.71963% with 22 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (748bea7) to head (18d365f).
Report is 30 commits behind head on dev.

Files	Patch %	Lines
bbot/core/engine.py	89%	15 Missing ⚠️
bbot/modules/report/asn.py	88%	4 Missing ⚠️
bbot/scanner/scanner.py	50%	2 Missing ⚠️
bbot/modules/deadly/ffuf.py	67%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #1678   +/-   ##
=====================================
- Coverage     93%     93%   -0%     
=====================================
  Files        341     341           
  Lines      26044   26067   +23     
=====================================
- Hits       24021   24011   -10     
- Misses      2023    2056   +33     

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