Implements CanvasView control

Implements CanvasView control

Control for drawing Vector Primitives.
CanvasView can draw a shape in its internal buffer
by adding a Dali::CanvasRenderer::Shape object and calling Commit().
Dali::CanvasRenderer::Shape is a command list based on Path.
Fill and Stroke properties can be set using setters and getters.
Dali::CanvasRenderer::Drawable is a parent class of Dali::CanvasRenderer::Shape and
it has common class of classes to be added later (Scene, etc.).

Note:
Currently, the CanvasView's buffer is using PixelData.
This buffer strategy will be changed to tbmBuffer in the future.

[API List]
class CanvasView : public control
  New
  AddDrawable

Change-Id: I50ade6fb981e72f3e4ccc1ec34cd82de784a7bd4