Migrate to pointer events

[piroor]

setCapture/releaseCapture are now deprecated and we need to update codes to use new setPoitnerCapture/releasePointerCapture. But they have some differences.

• pointerover/pointerout won't be dispatched and only pointermove will be dispatched while capturing. Moreover mouseover/mouseout also not dispatched while capturing by setPointerCapture.
  • TST listens mouseover/mouseout while capturing. We need to rewrite codes around those events with pointermove.
• setPointerCapture/releasePointerCapture requires pointerId. It is 0 for a mouse.
  • dragstart and other drag events have no pointerId. We need to store the last available pointerId by the listener of pointerdown.