Bug fix

Shift for enemies will now ignore vanish enemies (to avoid possible problems)

Make enemy moving animation more consistent.

Enemy positions now count for hidden enemies

Fix move buff cannot be resisted;
Fix bug when move buff is blocked.

Fix the bug that enemy positions are not properly sorted during swapping

Fix potential problem when multiple enemy swaps occur at the same time.

Add a function to shift position.
IP_PositionChanged on enemies now use the enemy physical position (based on transform.x).

Add function to change enemy positions