atk: updated to 2.36.0

Changes in version 2.36
=======================

* New API
  * Added ATK_ROLE_MARK and ATK_ROLE_SUGGESTION
  * Add ATK_TEX_ATTR_TEXT_POSITION to the list of possible AtkText
    attributes

* Documentation
  * Updated documentation for atk_text_set_caret_offset

* Building - meson
  * Fix building atk as subproject
  * Add Meson wrap file for GLib

* Building - visual studio
  * Use -utf-8 if available

Changes in version 2.35.1
=========================

* AtkComponent, AtkImage, AtkText: Make sure returned values are
  initialized to some known default value

* AtkPlug
  * Add atk_plug_set_child

* AtkSocket
  * Make AtkSocket get_extents return parent extents by default
  * atk_socket_embed: make plug_id parameter const
  * Make AtkSocketClass (embed) use const for plug_id

* AtkText
  * Make atk_text_rectangle_union ignore undefined rectangles

* Documentation
  * Refine *_scroll_to_point documentation
  * Refine AtkScrollType documentation

(adam)