argagg is yet another C++ command line argument/option parser. It was 
written as a simple and idiomatic alternative to other frameworks like 
getopt, Boost program options, TCLAP, and others. The goal is to 
achieve the majority of argument parsing needs in a simple manner with 
an easy to use API. It operates as a single pass over all arguments, 
recognizing flags prefixed by - (short) or -- (long) and aggregating 
them into easy to access structures with lots of convenience functions. 
It defers processing types until you access them, so the result 
structures end up just being pointers into the original command line 
argument C-strings.
