rewrite tests (#515)

* rewrite tests to work with meson

This ports our tests to meson and makes them able to be run in parallel.

* add tests to ci

* rewrite test/check-trailing-newlines in bash

This test was using a GNU sed command which does not work on Alpine Linux.

test/check-trailing-newlines.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+top_srcdir=${SOURCE_ROOT:-..}
+. ${top_srcdir}/test/setup_env.sh
+
+ebegin "Checking trailing newlines in code"
+out=$(cd ${top_srcdir};
+	for f in $(find */ -name '*.[ch]') ; do
+		while read -r line; do
+			if [ -n "${line}" ]; then
+				blankline=
+			else
+				blankline=1
+			fi
+		done < "${f}"
+		[ -n "${blankline}" ] && printf "%s\n" "${f}"
+	done)
+[ -z "${out}" ]
+eend $? "Trailing newlines need to be deleted:"$'\n'"${out}"