Separate Image Drawing and Positioning

[Anstow]

At the moment an Image is used as a component to draw other graphics as well as being a graphic itself, with position and the like. I think separating these functionalities into two classes perhaps Sprite for the graphic and Image can remain drawable.

Current plan:
Sprite:

• has position and rotation (and scaling) i.e. a coordinate frame
• contains an image
• contains "draw relative to camera" function
• may contain "draw at position" function?

Image:

• Contains source texture, potentially reusing images would be a way to reuse textures
• Has a "draw at position" function

Maybe a texture handler would also be useful?