+ Added support to rotate images of IMAGE_BITMAP type.
+ Added transformation_handle & pivot_handle parts in sheet.png.
+ Added rotation cursors in sheet.png.
+ Added gfx::Transformation class and Document::m_transformation field.
+ Added StandbyState::Decorator and TransformHandles class to draw
transformation handles.
+ Modified PixelsMovement class to support transformation handles.
+ Added new Linear Algebra library with Vector2d class.
+ Added support for non-zero transparent index.
+ Added fop_post_load() to do post-load processing which need user-interaction.
+ Added FileFormat::onPostLoad/onDestroyData members.
+ Added Document::addSprite().
+ Added "undo" library (undo namespace).
+ Moved UndoHistory to undo namespace.
+ Added Undoer and UndoersCollector interfaces.
+ Converted old UndoStream to UndoersStack class.
+ Added new "undoers" namespace and moved each Undoer implementation
(classes to undo different actions) to "undoers" directory.
+ Added IO operations to "raster" objects (image, cel, layer, palette,
mask).
obtain any kind of objects (not just GfxObj).
+ Removed GfxObjId.
+ Added ObjectsContainerImpl.
+ Use UniquePtr for each member in Document to avoid memory leaks in
Document() ctor.
+ Removed RasterModule class.
+ Moved some properties from Sprite to Document: lock/unlock/mutex,
filename, isModified flag, undo history, mask boundaries, file
format options, preferred editor settings, extra cel.
+ A Context now has an active document (instead of an active sprite).
+ Renamed all sprite wrappers to be document wrappers (as the mutex is
in the Document now).
+ Modifications to SharedPtr<> to be more like C++0x shared_ptr<>.
