BUGS:
    - Hud.dialogAction is overriden if end of turn happen at the end of an engagement
NOW:
    - Animations
        - promote
        - selected Hex
        - dice roll
    - battle description
    - toggle objectives

NEXT:
    - support different board layout
        - north orientation
        - hex orientation
        - inverted even/odd row scheme
    - automatic overlays to show unit stack depth