CVWidgetEditor: make actions-list scrollable

... if height of all displayed actions exceeds window-height
speed-optimization: xx@yy -> Point(xx, yy)

Signed-off-by:  <st9fan@gmail.com>
(cherry picked from commit f25a5c9101dfce240fd2a17f658c206e2258a6a2)
Signed-off-by: Stefan Nussbaumer <st9fan@gmail.com>

Conflicts:
	CVCenter/CVWidgetEditor.sc
	CVCenter/CVWidgetMSEditor.sc

... conflicts hopefully fixed