StrokeNo DELETE #162

Closed d-matsuura wants to merge 3 commits into nitta-lab-2021:master from nitta-lab-2021:strokeNo_DELETE

2021-06-18	92b66c3 Browse files » deleteStrokesでレイヤーごとのstrokeをすべて消去 t-tai committed on 18 Jun 2021
	e6ee3d2 Browse files » deleteStrokesでstrokeNoを指定して消去に変更 t-tai committed on 18 Jun 2021
	d3d2335 Browse files » deleteStrokesでひとつ前のStrokeを消去 t-tai committed on 18 Jun 2021