(HitTest) Added API to layer so that it can consume all touch if required

(HitTest) Added API to layer so that it can consume all touch if required

[problem]     Currently, the only way to stop gestures being delivered to actors behind a layer is
              by attaching the layer to a gesture detector which is cumbersome.
[cause]       N/A
[solution]    Implemented an API which allows the user to set whether a layer should consume all
              touch. When this is set on a layer, any layers behind that layer are not hit-test.

Change-Id: I34468c13a3b7b5f81a53ca4746a5c97a4ece09ba
Signed-off-by: Adeel Kazmi <adeel.kazmi@samsung.com>