Undoers were little objects to swap/revert an action. They didn't
execute the action itself, they just revert its previous state. Now
undoers were replaced with cmds: A cmd is an object that
executes/undoes/redoes just one action.
Changes:
* Remove old undo library and app/objects_container_impl.cpp
(now we use the doc::ObjectId directly to store undo info)
* Remove all Undoers from app/undoers/
* Replace DocumentApi impl with little Cmds in app/cmd/, these
cmds handle execute/undo/redo of each action at the logic layer
* Remove doc::Dirty object
* Remove doc::Settings: all undo configuration is in the app side
* Move undo options from app:ISettings to app::Preferences
* Rename UndoTransaction to Transaction
* Create a CmdSequence to store a sequence of Cmds (as now the new
undo library doesn't support open/close groups)
* Add doc::get<T>(ObjectId) function to get any kind of object
from the doc library by its ID
* Add Cel::document() and Sprite::document() members
* Add Sprite::cels(frame_t) to get all cels in the given frame
* Add Layer::displaceFrames() member function
* Move the "allow non-linear history" flag from undo2::UndoHistory
to app::DocumentUndo
- Merge Timeline::STATE_MOVING_LAYER/CEL/FRAME to STATE_MOVING_RANGE.
- Remove celmove.h/cpp and move_cel/copy_cel functions. Now they are
in the Timeline as dropRange/Cels/Frames/Layers member functions.
- Add DocumentApi::copyFrame/moveCel/copyCel member functions.
- Add timeline_drop_layer_deco and timeline_drop_frame_deco skin parts.
- Move code from DuplicateLayerCommand::onExecute() to new member
function DocumentApi::duplicateLayer().
- Fix a bug changing Cel's frame number: we weren't updating the Cel
position properly inside the LayerImage::m_cels collection. Now we use
LayerImage::moveCel() to change the Cel frame number.
- Other fixes to DocumentApi: Change bgcolor from int to color_t.
- Add HAVE_CONFIG_H wrapper to #include "config.h"
- Removed widgets namespace (it's in app now)
- Move some functions from src/file/file.h to src/base/cfile.h
- Move Vector2d to base library
- Rename MenuItem2 to AppMenuItem
