'con' program to control the console

[fachat]

A simple program that takes command line params and sends corresponding control codes to the terminal.

Should be developed in conjunction with #52 i.e. a standard lib for sending control codes:

e.g.:

con win ul 1 2 win lr 10 20

would call con_wul() and con_wlr() respectively with the given row and column values. Those would then send the appropriate control codes to the STDOUT (given?) stream (maybe use con_setstr() to define which stream to send to, with STDOUT as default).