evasion
  - new command: 'evasion'
    - -l, list evasion subsystems
    - set evasion subsystem level
    - get evasion subsystem level
    - set global evasion level
    - get global evasion level
  - modules cache evasion level at creation time
  - modules pass evasion flags onto sockets via params
  - sockets and protocols register subsystems
    - sockets to take passed evasion level in precedence over subsystem/global
  - consider http evasion
    - random headers
  - consider EvasionLevel advanced option on all exploits

misc
  - session sharing through multiplexing

recon
  - track exploit success, failure, host information
  - support searching the knowledge base