miniupnpd: rework firewall4 integration

miniupnpd: rework firewall4 integration

 - Bump to the latest Git version in order to increase the package version
   for simpler opkg upgrade of the broken version

 - (Re-)Introduce PKG_RELEASE into the package, omitting it may lead to
   opkg segmentation faults under certain circumstances

 - Utilize automatic include hooks to drop the isolated miniupnpd table
   in favor to chains within the main inet fw4 table, otherwise PCP is
   unreliable as the upnp table might accept traffic which is later
   rejected by fw4

 - Install a fw4 script hook to restart miniupnpd on fw4 restarts and
   reloads in order to repopulate the upnp chains with forward rules

 - Register the used miniupnpd configuration file and the firewall uci
   configuration as change sources, otherwise `/etc/init.d/miniupnpd reload`
   has no effect if the firewall or upnpd config was changed

Signed-off-by: Jo-Philipp Wich <jo@mein.io>