win: Add EO API to query state of multi touch points

win: Add EO API to query state of multi touch points

This combines evas canvas functions to list and query
touch points into a single iterator:
 - evas_touch_point_list_count
 - evas_touch_point_list_nth_xy_get
 - evas_touch_point_list_nth_id_get
 - evas_touch_point_list_nth_state_get

This also fixes a number of issues related to feeding fake
input events.

Note: I wanted to add delta x,y information as well but it's
in fact not really possible outside the event callback itself,
as the previous x,y position will not be updated unless there's
an event.

@feature