Basically, the painting assistants could not be individually toggled for
snapping, so I added toggle-buttons for that(eye shape).

Next to that, there's also previews added. These are most visible when
using the perspective assistant, but will also be visible on the others
if you turn off the painting assistants in view.
There's a similar new action for turning off the painting assistants in
view, but this may require deleting the kritarc in the share/apps
folder(not the one in share/config).