Multi-tile Units does not handle damage correctly

[perara]

deep-rts/src/Tile.cpp

Lines 262 to 270 in 148df8d

	void Tile::update(Unit& unit) const {
	// TODO - does not handle multi-tile blocks (for example Town-Hall)
	// TODO - maybe this is OK?
	if(hasOccupant() && damageModifier > 0){
	unit.afflictDamage(std::ceil(damageModifier));
	}
	}

In multi-tile units, the damage is only applied to the "primary tile". Units currently only reference1 tile, but perhaps there should be a list of "secondary tiles"