(Button/PushButton) Registering properties using the type-registry.

(Button/PushButton) Registering properties using the type-registry.

[Issue#]   N/A
[Problem]  N/A
[Cause]    N/A
[Solution] Property registration via type-registry added to core which allows the addition of
           event-side only properties to an actor on library load time.
           Button dimmed property changed to this property type.
           Added properties to push-button with this property type.

Change-Id: I95b4cd3cf02c071d74c3147ba1d48ecf835b39a9
Signed-off-by: Paul Wisbey <p.wisbey@samsung.com>