This commit replaces the old rudimentary log handler
by a shinier version of it. It also introduces the
debugging macros that I usually add to the apps,
including the CC_TRACE_MSG() macro for tracing.
The bluetooh, network and wacom panels should not be optional
on linux, except on s390 systems which lack USB support. It
should also not be built at all on other systems.
This patch makes these panels mandatory on linux.
https://bugzilla.gnome.org/show_bug.cgi?id=792641
Meson is a build system focused on speed an ease of use, which
helps speeding up the software development. This patch adds meson
support along autotools.
https://bugzilla.gnome.org/show_bug.cgi?id=785414