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Symbols in libknot/internal/ should not have knot_ prefix unless
they are a replacement for a system function.

+ Visibility in errcode.c, dname.c, descriptor.c, consts.c

Converting to lowercase when saving to zone proved insufficient,
because case-insensitive comparison of RDATA would be needed in some
scenarios - e.g. in IXFR (SOA replacement) and DDNS processing.

Moved the conversion to packet parsing - all dnames in RDATA
are converted to lowercase when parsed from wire. RDATA parsed
from zone file are converted there (in scanner_process()). Later
the conversion may be moved to a lower level of parsing (and with
some option to turn it on/off).

QNAME is unaffected by this change.

Conflicts:
	Knot.files
	src/knot/nameserver/update.c
	src/knot/nameserver/update.h
	src/knot/server/tcp-handler.c
	src/knot/zone/events.c
	src/knot/zone/zone.c
	src/knot/zone/zone.h
	src/libknot/packet/net.c
	src/libknot/rdataset.c
	src/utils/nsupdate/nsupdate_params.h

missing