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Sanitise unsafe functions, GNUC annotations

This is an attempt to sanitise unsafe functions in libknot API which allow easy out-of-bound reads or undefined return value. The other part is annotating most used functions with appropriate attributes.

See merge request !466

Configurable timer database location.

annotated some functions where it doesn’t make sense if caller doesn’t check the result, and pure functions which may be used for common subexpression elimination and vectorization

RRL: support zero slip



See merge request !464

doc: improve RRL description



See merge request !463

Setting malformed RDATA will invalidate existing RDATA leading to
use-after-free or double-free later.

This is the initial merge request for zone-api. Changes are quite
simple, mainly moving code from one place to the other and adding
a bunch of functions to deal with it. So far the only advantage is
a bit simpler code in the DDNS code and simpler API for it. The insides
are not so nice yet as it requires further work on the changesets.

getting next label of the last label returns invalid pointer which is almost always not what caller wants. new implementation returns null when “next of last label” is requested

when setting key from rdata, a copy of binary data struct is made.
that struct is then resized to accomodate for new key.
if successful, binary data points to freed memory
when pubkey parsing fails, the resized copy is discarded
and key binary data left with dangling pointer
freeing key causes double-free and using it use-after-free

LibFuzzer support

This changeset contains:

- support for compiler sanitizers and sanitizer coverage in configure
- support for LibFuzzer
- fuzzy test for packet based on LibFuzzer
- fix for NAPTR RR parsing (found by LibFuzzer)
- limit for maximal number of RRs in a parsed packet

See merge request !460

found by LibFuzzer