>3.4 various features for workflow visualizer

[minsis]

Carried over from the 3.4dev discussion thread.

Some random feedback:

• The save button in the visualizer is easy to miss as it looks like its more of a navigation button. Maybe put a big button that says "Save"; same goes for the run button
• I know workflows have to have an action behind it, but it seems like it would be cleaner to maybe have the visualizer in its own tab?
• When hovering over the anchor point on a task object maybe have the icon change to a move icon.
• When closing the visualizer after making a change there should be a warning telling you that you haven't saved anything.