banIP: release 1.5.1-1

banIP: release 1.5.1-1

* optimized the f_nftload function
* reduced the prerouting priority to -175
* optimized the output of the f_survey function
* removed a needless fw4 call/check
* no longer skips regular blocklist feeds in "allowlist only" mode
* optimized init checks
* turris feed: enable IPv6 parsing, too (prvided by @curbengh)
* update the readme

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