Target improvement

[TheTechromancer]

Improves the efficiency of target creation through an intermediate "EventSeed" class, which has only the minimum parsing+data required for intaking targets, and determining their scope.

This will improve performance and allow larger target lists in BBOT, while also increasing the speed of scope checks in BBOT server.

This PR also predefines __slots__ on the base event class, which should dramatically reduce memory usage in large scans.

[codecov]

Codecov Report

Attention: Patch coverage is 94.70199% with 24 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (43822a8) to head (ea16d45).
Report is 28 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/scanner/target.py	85%	11 Missing ⚠️
bbot/logger.py	69%	6 Missing ⚠️
bbot/core/event/helpers.py	99%	2 Missing ⚠️
bbot/scanner/manager.py	89%	2 Missing ⚠️
bbot/scanner/scanner.py	75%	2 Missing ⚠️
bbot/cli.py	0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             dev   #2396    +/-   ##
======================================
- Coverage     93%     93%    -0%     
======================================
  Files        382     383     +1     
  Lines      29934   30144   +210     
======================================
+ Hits       27684   27866   +182     
- Misses      2250    2278    +28     

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