build: Port to Meson build system

Meson is a build system focused on speed and ease of use, which
helps speed up software development. This patch adds Meson support
alongside Autotools.
3 jobs for master in 8 minutes and 20 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #111600
flatpak

00:08:19

manual #111599
allowed to fail manual
gtk-doc
passed #111598
master

00:03:25