- move fromWhichHexAttack to CBattleInfoCallback
- add toWhichHexMove (unifying incoherent duplicates)
- add battleGetOccupiableHexes
- add battleCanAttackHex for spatial attack check
- add battleCanAttackUnit for non-spatial attack check
- add headDirection to Unit (removing destShiftDir from CStack)
- remove redundant game logic from selectAttackDirection
- remove redundant game logic from BattleFieldController and BattleActionsController
- fix no consideration for double-wide tail attack in BattleFlowProcessor
- fix#6302 wrong moat stopping condition
- throw exception on attacker nullptr in battleCanAttackHex, fromWhichHexAttack
- safer actionIsLegal on attack, move
- remove redundant canStackMoveHere from ui code
- throw exception on nullptr unit in battleGetOccupiableHexes
- ensure activeStack in redrawBackgroundWithHexes
- test point validity in selectAttackDirection
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