* fix regex capture (to conform std)
* fix issues for Clang/libcxx (warnings/includes)
* fix CONFLICTS in the Makefile
* use /bin/sh in host scripts and shellcheck them
* add callback for setting arguments in ubus::call

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

This can do the main work of nginx/nginx-ssl init script.
For nginx-ssl it can create selfsigned certificates, too.
It uses libpcre and libopenssl iff nginx(-ssl) uses them.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>