module: create new API with dynamic loading support

Knot.files

src/Makefile.am

src/knot/common/stats.c

src/knot/conf/base.c

src/knot/conf/base.h

src/knot/conf/confio.c

src/knot/conf/module.c

src/knot/conf/module.h

src/knot/conf/scheme.c

src/knot/conf/tools.c

src/knot/conf/tools.h

src/knot/ctl/commands.c

src/knot/include/module.h

src/knot/nameserver/axfr.c

src/knot/nameserver/axfr.h

src/knot/nameserver/internet.c

src/knot/nameserver/internet.h

src/knot/nameserver/ixfr.c

src/knot/nameserver/ixfr.h

src/knot/nameserver/notify.c