cogl: Make CoglSubTexture only work for quad rendering

The sub texture backend doesn't work well as a completely general
texture backend because for example when rendering with cogl_polygon
it needs to be able to tranform arbitrary texture coordinates without
reference to the other coordintes. This can't be done when the texture
coordinates are a multiple of one because sometimes the coordinate
should represent the left or top edge and sometimes it should
represent the bottom or top edge. For example if the s coordinates are
0 and 1 then 1 represents the right edge but if they are 1 and 2 then
1 represents the left edge.

Instead the sub-textures are now documented not to support coordinates
outside the range [0,1]. The coordinates for the sub-region are now
represented as integers as this helps avoid rounding issues. The
region can no longer be a super-region of the texture as this
simplifies the code quite a lot.

There are two new texture virtual functions:

transform_quad_coords_to_gl - This transforms two pairs of coordinates
     representing a quad. It will return FALSE if the coordinates can
     not be transformed. The sub texture backend uses this to detect
     coordinates that require repeating which causes cogl-primitives
     to use manual repeating.

ensure_non_quad_rendering - This is used in cogl_polygon and
     cogl_vertex_buffer to inform the texture backend that
     transform_quad_to_gl is going to be used. The atlas backend
     migrates the texture out of the atlas when it hits this.

cogl/cogl-vertex-buffer.c

@@ -1637,6 +1637,11 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
       if (tex_handle == COGL_INVALID_HANDLE)
         continue;
 
+      /* Give the texture a chance to know that we're rendering
+         non-quad shaped primitives. If the texture is in an atlas it
+         will be migrated */
+      _cogl_texture_ensure_non_quad_rendering (tex_handle);
+
       if (!_cogl_texture_can_hardware_repeat (tex_handle))
         {
           g_warning ("Disabling layer %d of the current source material, "