Pangocffi

**Additions**

* Added new methods to `Layout`. 19
* `set_wrap`
* `get_wrap`

* Added new methods to `Layout`
* `set_ellipsize`
* `get_ellipsize`

* Added support for Win64 dynamic libraries.

* Added `FFIInstanceBuilder` to separate C FFI build logic from the actual C FFI builder.

* Added the following new classes:
* `GlyphItem`
* `GlyphItemIter`
* `Item`
* `LayoutIter`
* `LayoutRun`
* Added new methods to `Context`
* `set/get_base_gravity`
* `get_gravity`
* `set/get_gravity_hint`
* Added new methods to `Layout`
* `get_text`
* `get_iter`
* `get_baseline`
* `get_line_count`
* `get/set_spacing`
* Added new method to ``Rectangle`
* `get_pointer`
* Corrected return types (`ffi.CData` was previously `ctypes.c_void_p`)

* `FontDescription.getWeight()` now returns `int`, instead of the `Weight` enum.