If the Timeline has an active selected range of layers and the user
creates a new layer group, the selected layers will be be grouped as
children of the new layer 'group'.
This is a first step to include the current selected range of layers
and frames inside the doc::Site structure. So in the future we'll not need
to know about the Timeline in commands that handle those ranges.
Changes:
* Add KeyboardShortcutsCommand and window
* Add SelectAccelerator window
* Replace modules/gui.cpp functions with app::KeyboardShortcuts and
app::Key with the logic to load/save/handle keyboard shortcuts
* Change ui::Accelerator concept: now it represent just one keyboard
shortcut, not a set of shortcuts
* Remove ui::Accelerator from ui::MenuItem, now the key is associated
in app::AppMenuItem and it's a app::Key
* Add Command::onGetFriendlyName() to get a user friendly name of the
command depending on its parameters
- 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