Added WIP support for affine transformations to BViews.

Everything untested, but compiles, so it must work. The idea is to introduce
BAffineTransform additionally to the existing Origin and Scale properties of
BViews. One may use it in parallel or as an alternative. Painter in app_server
is not yet aware of the additional transformation. It is however already used
to transform drawing coordinates. It probably needs to work differently,
perhaps only in Painter and AGGTextRenderer.

headers/os/interface/View.h

@@ -6,6 +6,7 @@
 #define	_VIEW_H
 
 
+#include <AffineTransform.h>
 #include <Alignment.h>
 #include <Font.h>
 #include <Handler.h>
@@ -285,6 +286,12 @@ public:
 			void				SetOrigin(float x, float y);
 			BPoint				Origin() const;
 
+								// Works in addition to Origin and Scale.
+								// May be used in parallel or as a much
+								// more powerful alternative.
+			void				SetTransform(BAffineTransform transform);
+			BAffineTransform	Transform() const;
+
 			void				PushState();
 			void				PopState();