homescreen: Change from qmake to meson

homescreen: Change from qmake to meson

This change will basically make way for adding grpc/protobuf support
into homescreen, which turns out it's a pain to do with either qmake or
cmake. Eventually, we'll move all our demos to using meson, which have
gained a lot of support for building and support different technologies
to allow far more saner configurations to take place.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Id64bf3d5b41912d32df7f78e94ab04d231bb0c83