Don't refresh every time cursor moves

It was becoming noticeably slow.
Factor out NextActions() call

Paves the way for Recurring actions, Waiting, etc...
Factor out NextActions patch-related stuff

Paves the way for other Views (Waiting, Recurring, ...)
Add [R]ecurring Actions view, including checkoff
Add [W]aiting view, including checkoff
Checkoff with <Space> instead of <C-Space>