[URLRequest] digest property

The value is not actually checked because loading an SWZ is yet not
supported.
[LoaderContext] allowCodeImport and allowLoadBytesCodeExecution
[LoaderContext] parameters property
g_static_private API is deprecated since glib 2.31
[Array] Constructor should throw if the argument is not uint
[Array] Array index can not be larger than UINT32_MAX
[Array] The setter should check if a subclass of Array is sealed