New rotation system (see forum thread).

Major changes:
  - when rotating, the top left corner of the rectangle stays in place.
  - ValueViewers get a dc that is pre-rotated/translated for them, i.e. (0,0) is the top-left of the viewer (with ValueViewer::getRotation).
  - moved 'angle' from individual Styles to the Style base class.
  - any rotation angle is now possible. angle is still an int for now.

This warrants a version bump

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@782 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gfx/generated_image.hpp

@@ -33,7 +33,8 @@ class GeneratedImage : public ScriptValue {
 			, package(package), local_package(local_package)
 		{}
 		
-		int            width, height;	///< Width to force the image to, or 0 to keep the width of the input
+		mutable int    width, height;	///< Width to force the image to, or 0 to keep the width of the input
+										///< In that case, width and height will be later set to the actual size
 		double         zoom;            ///< Zoom factor to use, when witdth=height=0
 		int            angle;           ///< Angle to rotate image by afterwards
 		PreserveAspect preserve_aspect;