#219 Drag-and-drop support for interactions pane

[Dan Smith]

A .java file dragged from the file list pane into the
interactions window causes an import statement for each
class in the file to be entered into the interactions.
A project folder imports the entire class.

This would make interactive testing easier, eliminating
the need to import the class that's being tested.

[Charles Reis]

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What about automatically importing the packages of open
classes instead?

I'd be concerned with drag-and-drop, because I had no idea
what the intended result was without reading the rest of the
feature request (and I would never have guessed importing).
Unfortunately, even auto-import is a little unintuitive and
could lead to strange behavior. If not auto-import, perhaps
a contextual menu item by right clicking on the document
name or project folder?

[Jonathan Lugo]

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The context menu item would not be difficult to implement at
all. Each document is already capable of returning the
package declared in its text. I assume there's already an
easy means of actually inputting/executing commands in the
interactions.