gst-project-maker: set up a meson project instead of an autotools one

gst-project-maker: set up a meson project instead of an autotools one

Now that autotools has been removed generate a meson project template in
gst-project-maker.

There are some differences with the autotools project

  1. gstreamer-controller-1.0 is not added to the default dependencies.
  2. The '-Wall' option is not set explicitly, meson can handle that.
  3. The flags in GST_PLUGIN_LDFLAGS have not been ported to meson as
     they are not necessary anymore.

The generated project requires meson 0.53.0 for the 'fs' module. It's up
to the user to remove that part in case compatibility with older
versions of meson is desired.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/184>