Update the AddRule interface to allow rules to register interest in
multiple ast.Nodes. Adds more flexibility to how rules can work, and was
needed to fix the hard coded credentials test specifically.
This makes the following changes:
- riles are identified by an ID
- include / exclude list now work
- rules are selected based on these lists
- blacklist rules are broken out into methods
- rule constructors now take the config map
- config file can be used to select rules
- CLI options embelish config selection options
There are some cases where the '.' character would also match any
character and could lead to incorrect results. For example the
regular expression - `^ioutils.WriteFile$' would match
ioutils.WriteFile, but also ioutils_WriteFile.
Additionally made sure that all regexp were declared using raw
strings to avoid any unnecesary string escaping that potentially
make the regexp difficult to read.
