private void RemoveTilesThatAreNoLongerSelected(List <Vector3> tilesBetweenFirstAndPointer)
{
for (int i = (SelectedTiles.Count - 1); i >= 0; i--)
{
Vector3 tile = SelectedTiles[i];
if (!tilesBetweenFirstAndPointer.Contains(tile))
{
SelectedTiles.Remove(tile);
}
}
}