Support local files/folders and mobile apps as targets

[TheTechromancer]

Adds support for the following target types:

• FILESYSTEM (FILESYSTEM:/tmp/asdf)
• MOBILE_APP (MOBILE_APP:https://play.google.com/store/apps/details?id=com.evilcorp.app)

[codecov]

Codecov Report

Attention: Patch coverage is 93.10345% with 4 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (48c0859) to head (cab7aaa).
Report is 10 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/core/event/base.py	90%	2 Missing ⚠️
bbot/scanner/target.py	85%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2093   +/-   ##
=====================================
- Coverage     93%     93%   -0%     
=====================================
  Files        376     376           
  Lines      28689   28745   +56     
=====================================
+ Hits       26491   26532   +41     
- Misses      2198    2213   +15     

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