Support longest key sequence match with user defined delay (configurable
through 'Customize -> Keyboard -> Key sequence delay').
Support user defined priority to resolve shortcut conflict through
'Customize -> Keyboard')
Add 'All' category in 'Customize -> Keyboard' to list all command and
showing their shortcuts
Unify macro command shortcut setting (BaseApp/Preferences/Shortcut).
fix file chooser in macro dialog
do not remove GUI text from translation
remove friend class declaration, use Qt's introspection mechanism
create dialogs on the stack because they are modal
some minor optimizations
