the utility supports most of the 'unbound-host'
functionality except PTR records

this is a boilerplate for a CLI utility to resolve
names and execute script on query response
in another words, "a jq for resolver answers"

this is a scaffolding for alternative tools like
'host' or a plug-in part for scripting around it.

it basically starts a kresd instance, but doesn't
bind to any interface or read configuration,
then a query + callback is sent to kresd standard
input, and it quits after the execution

this is not going to be backwards compatible change, but it will be the first tagged libknot release sufficient for resolver

thanks @darix!
fixes #21,#22

this should help packaging the project to other platforms

thanks @darix!

thanks to johan ihren

this also fixes static linking missing a math library

also some cleanup and version bump to Q2