Add blacklist regex feature

[TheTechromancer]

Addresses:

• Blacklist by Keyword #1310
• v2.1.2.5161rc Errors #1931

TODO:

• Test regex blacklist
• Test invalid targets (python api + cli)
• Documentation for blacklist regex

[codecov]

Codecov Report

Attention: Patch coverage is 98.02867% with 11 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (1928939) to head (3fc7ed4).
Report is 30 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/scanner/target.py	99%	3 Missing ⚠️
bbot/core/engine.py	0%	2 Missing ⚠️
bbot/core/helpers/bloom.py	67%	2 Missing ⚠️
bbot/cli.py	0%	1 Missing ⚠️
bbot/modules/baddns.py	0%	1 Missing ⚠️
bbot/scanner/manager.py	0%	1 Missing ⚠️
bbot/scanner/preset/preset.py	88%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             dev   #1899    +/-   ##
======================================
+ Coverage     93%     93%    +1%     
======================================
  Files        368     368            
  Lines      28125   28247   +122     
======================================
+ Hits       25917   26064   +147     
+ Misses      2208    2183    -25     

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