This is the first step to have settings per document. Currently
IDocumentSettings is implemented as a global instance so all documents
share the configuration (as it was already working). But in the future
a project will be able to provide an alternative implementation to save
the configuration of each document in the same project.
The UndoHistory was simplified, m_enabled/label/modification members
were removed because they aren't part of the undo library goal.
Now the "label" field is part of Open/CloseGroup undoers, and all undoers
must be enclosed in a group (this restriction is only for the app, the
undo library doesn't have this restriction). In this way, the
label/modification information is exchanged between an
OpenGroup <-> CloseGroup pair only.
The PixelsMovement uses the document's extra cel to show the transformation
preview. On the other side, painting tools use the extra cel to show
the drawing cursor preview. So MovingPixelsState is incompatible
with painting tools, both use the extra cel for different purposes.
+ 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.
+ 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<>.
+ Added Filter, FilterManager, and FilterIndexedData interfaces.
+ Moved all widgets related to filters to src/commands/filters.
+ Added the filters library.
+ Added FilterWindow and one derived window for each filter.
