wireguard-tools: bump to 1.0.20200102

wireguard-tools: bump to 1.0.20200102

* systemd: update documentation URL
* global: bump copyright

Usual house keeping.

* Makefile: DEBUG_TOOLS -> DEBUG and document
* Makefile: port static analysis check
* dns-hatchet: adjust path for new repo layout
* Makefile: rework automatic version.h mangling

These are some important-ish cleanups for downstream package maintainers that
should make packaging this a lot smoother.

* man: add documentation about removing explicit listen-port

Documentation improvement.

* wg-quick: linux: quote ifname for nft

This should fix issues with weirdly named ifnames and odd versions of nft(8).

* fuzz: find bugs in the config syntax parser
* fuzz: find bugs when parsing uapi input

These are two fuzzers that have been laying around without a repo for a while.
Perhaps somebody with enough compute power will find bugs with them.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>