msfvenom - Added advance options
msfcli - show subheading for sections
msfcli - fixed impcomplete argument parsing
Only catch Rex::ArgumentParseError

Avoid catching all exceptions, that way we don't actually shut up
other possible errors that are actually bugs.
Land #2098 - Catch Rex::ArgumentParseError
Land #2096 - Be able to show advanced options in msfvenom
Fix typo
Ditch all caps message format
Land #2097 - show subheading for sections
Land #2102 - Fix typo

English is hard