Add "-M" and "-MM" command line options about cplusplus HOT 2 OPEN

I finished my MVP and the output matches the clang output (gcc too although gcc uses one space and clang uses two to at the beginning of each filename dependency) see here #313 .

from cplusplus.

This is my first step on a more ambitious feature that would dump each included file and show some stats about the context about it:

• List of external referenced macros and it's values before include
• List of external referenced macros changed (updated/deleted) after include
• List of created macros after include

The idea is also to check if a giving file is attempted to be included more that once globally and if it has #pragma once or guard macro and the external referenced macro values have changed since it's first inclusion emit a warning/error .

from cplusplus.