adblock: update to 0.70.0

adblock: update to 0.70.0

* openwrt init system support, see /etc/init.d/adblock
* support for two new adblock sources: openphish and ruadlist/easylist
* partial block list restore, i.e. if a single list download failed
* fix performance regression on sites with links to https ad servers
* removed no longer used samples dir
* updated documentation

Signed-off-by: Dirk Brenken <redacted>