* UI scale is an experimental option (it needs app restart)
* We can change the Screen Scale without restarting the app now
* Hide reloading of skin data in SkinTheme::onRegenerate()
* Now setFontOfAllWidgets() is called from Theme::regenerate()
* Remove reload_default_font()
* Simplify gui_setup_screen()
With this change we don't adapt the UI Scale automatically depending of
the display size, as it cannot be adjusted dynamically anyway (as the app
must be restarted to take this change correctly).
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
Changing the mouse position isn't user-friendly in desktop apps, and
has several problems in some platforms (Mac OS X). In this way we've
changed the approach to handle the mouse position when it goes outside
the ui::Editor viewport.
