Reimplement the icon item to render svg directly.

Some regressions sorry, need also to fix pygoocanvas...

shell/home/DonutItem.py

@@ -20,8 +20,8 @@ class PieceIcon(IconItem):
 		x = icon_radius * math.cos(icon_angle)
 		y = - icon_radius * math.sin(icon_angle)
 
-		icon_width = self.get_property('width')
-		icon_height = self.get_property('height')
+		icon_width = self.get_property('size')
+		icon_height = self.get_property('size')
 		self.set_property('x', x - icon_width / 2)
 		self.set_property('y', y - icon_height / 2)
 

shell/home/HomeGroup.py

@@ -68,8 +68,8 @@ class HomeGroup(goocanvas.Group):
 		profile = sugar.conf.get_profile()
 		me = IconItem(icon_name = 'stock-buddy',
 					  color = profile.get_color(), size = 150)
-		me.translate(600 - (me.get_property('width') / 2),
-					 450 - (me.get_property('height') / 2))
+		me.translate(600 - (me.get_property('size') / 2),
+					 450 - (me.get_property('size') / 2))
 		self.add_child(me)
 
 	def __theme_changed_cb(self, theme):

shell/home/IconLayout.py

@@ -20,8 +20,8 @@ class IconLayout:
 		self._icons.remove(icon)
 
 	def _is_valid_position(self, icon, x, y):
-		h_border = icon.props.width + 4
-		v_border = icon.props.height + 4
+		h_border = icon.props.size + 4
+		v_border = icon.props.size + 4
 		if x < self._x1 - h_border or x > self._x2 + h_border:
 			return True
 		if y < self._y1 - v_border or y > self._y2 + v_border: