ANSI highlighter

ANSI format for kate-syntax-highlighter:

$ ./bin/kate-syntax-highlighter -fansi256Colors a.cpp

For the moment, the background and text colors are by default that of the terminal. I am thinking of changing that, perhaps with an additional option.

There is also an option that displays the name of the formats:

I'm going to add regions and contexts, but for now the code is ugly with some bugs.

Note: I use a variant of Breeze dark as the theme