Revert "public-libs: Prefixed mempattern + visibility"

This reverts commit 5f1f66cfff0bd0cdf3547c59e6273e4fc87955e2.

Conflicts:
	src/common/mempattern.c
	src/knot/nameserver/process_answer.c
	src/libknot/common.h
	src/libknot/dname.c
	src/libknot/dname.h
	src/libknot/packet/pkt.c
	src/libknot/packet/rrset-wire.c
	src/libknot/processing/overlay.c
	src/libknot/processing/requestor.c
	src/libknot/processing/requestor.h
	src/libknot/rrset-dump.c
	src/libknot/tsig-op.c