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We are making it behave like a dict, so we should provide the
same kind of utilities.

Otherwise we lose the information about what type of range it is, which
is mandatory, especially when dealing with Structure and Caps.

They use the range() built-in type which is a Python 3 change.

https://bugzilla.gnome.org/show_bug.cgi?id=782927

This is required by the new loader macro.

This is needed to support matrix. Otherwise, getting
a matrix would remove the rows envelopess, which would
make the "cast" fails, since it would not know if the
internal rows are ValueArray or ValueList. I think reading,
modifying and setting back the matrix is an important use
case.

This reduces a lot the boiler plate all over. At the same
time, use N instead of O when passing PyObject to fix
the objects leaks.

This patch adds overrides to support IntRange, Int64Range, DoubleRange,
FractionRange, Array and List. For integer ranges, it maps this
to python 'range'. Gst.IntRange() and Gst.Int64Range() are simple cast
to let the underlying code know which GType to use. To set such range in
python you will do:

  structure["range"] = Gst.IntRange(range(0,10,2)))

Same for the 64 bit variant. And when you do:

  r = structure.get_value("range")

A range will be returned directly, without the wrapper. For DoubleRange
and FractionRange, there is no native support in python. So the usage
will be:

  structure["range"] = Gst.DoubleRange(0,10.0)
  structure["range"] =
      Gst.FractionRange(Gst.Fraction(1/30), Gst.Fraction(1/5)

When getting this value, Gst.DoubleRange and Gst.FractionRange class are
returned. They both have start/stop members. The naming was taken from
range type.

For Array and List, both uses the native list type, though they can be
constructed from any python sequence. So again, the class is just like
a cast, to let it pick the right GType and python list are being
returned.

  structure["list"] = Gst.ValueList([1,2,3,4])
  structure["array"] = Gst.ValueArray([1,2,3,4)

Using string and tuple could also work. Since Gst.ValueList/Array are
sequence, you can convert one to the other with:

  list = Gst.ValueList([1,2,3,4])
  array = Gst.ValueArray (list)

https://bugzilla.gnome.org/show_bug.cgi?id=753754

And make sure python detector did not fail

https://bugzilla.gnome.org/show_bug.cgi?id=780369

Adjust meson requirement to same as used in other modules.

https://bugzilla.gnome.org/show_bug.cgi?id=775110

As overrides_hack is being used as user sitecustomize script

Created a simple BaseTransform element (identity)

https://bugzilla.gnome.org/show_bug.cgi?id=772853

Paths like /usr/lib/python3.5/config-3.5m-x86_64-linux-gnu would not be
detected by the old code, but it's all nicely stored in sysconfig so
let's just use that.

    https://github.com/mesonbuild/meson