adblock: release 2.0.0

adblock: release 2.0.0

* changed complete dnsmasq handling
  - no longer redirect ad requests to internal web server via firewall
    rules etc., in fact send back a simple NXDOMAIN for all
    ad related (sub-)domains
  - smaller memory footprint for block lists
  - removed needless uhttpd instances
  - removed needless firewall rules/redirects
* init/hotplug system migrated to procd
  - removed hotplug.d script, now using procd interface trigger
* reduced code size/complexity
  - removed needless internal pre-checks & function blocks,
    no longer rely on a separate helper library
  - removed flash writes to adblock config
* support different download tools like wget (default), aria2c,
uclient-fetch, curl (see online doc)
* adblock status/statistics via ubus call (see online doc)
* various bug fixes
* documentation update
* changed makefile copyright notice

Signed-off-by: Dirk Brenken <dev@brenken.org>