arg - comand line argument library

Small replacment for getopt functionality, remove messing around with standart while loop and just add argument definitions and get back values. Removes from process define new value where to store and and adding new case in swithch inside loop.

Supports

Now is supported trigering flag and string.

TODO

Add list of values, IP4, IP6, ranges, custom callback support, float
numbers,file path,direcotry,linux socket, specific devices? like loop one.

Something more that could make usual life of smashing keyboard more non routine?