Overrideable/includable Makefile
Initial work on an INPUT action

Having a problem on my workstation so I can't build the code. Gonna try to
build it on my server and see if the error is any different.

The INPUT action doesn't work completely yet, but I am hopeful that I have the
pcre stuff correct.

-   add an INPUT action and do_input_action() function
-   reorg the action selection code
-   write half of hex2buf()
-   add a dependency on the pcre library