refactor selectors and actions

libs

libs

proper save for buffs

add decorator pattern

fix abstract factory

observer pattern plus death sound

better singleton

create end game screen

refactor code/event system

add gulyay gorod unit

make UserInterface singleton

unify bell logic

introduce page stack

introduce unavailable selector items

add undo redo

make delete function in save menu

make log bigger in fight menu

Make selectors work with new IKeyAction type

Introduce IKeyAction for actions binded to keyboard keys

big refactor

fix battle screen a bit

Implement event observers

Refactor actions

More fixes for save load

Fix load save game

clean clean

Add gigant

use interfaces

sey gax

some fixes

use factory for units