Dali C# binding - Implement the pure C# classes

Dali C# binding - Implement the pure C# classes

Implementation of Pure high-level C# classes and use
C#'s implicit convertion operators to covert from
C# Color, Position & Size classes to Dali Vector4,
Vector3 and Vector2 classes.

Change-Id: I6a68268c8e1511697479ca9f94356961bca5a7bd
Signed-off-by: Emil Abraham <emil.abraham@samsung.com>