Added elm_map_user_agent_set/get.
Added elm_map_overlay(s)_add/get/del.
Added elm_map_overlay_type_get.
Added elm_map_overlay_hide_set/get.
Added elm_map_overlay_displayed_zoom_min_set/get.
Added elm_map_overlay_paused_set/get.
Added elm_map_overlay_visible_get.
Added elm_map_overlay_content_set/get.
Added elm_map_overlay_icon_set/get.
Added elm_map_overlay_region_set/get.
Added elm_map_overlay_color_set/get.
Added elm_map_overlay(s)_show.