DragDropManager: Add support for multiple startDrag

[subdan]

Hello, Josh. I want to use DragDropManager to drag multiple objects at the same time. Could you add support for this?

[joshtynjala]

I'm guessing that it would be tricky to drag multiple objects at the same time. I don't think that this is something that I can implement any time soon.

[subdan]

I tried to do it by myself. I’ve removed all “static” words from DragDropManager. Next, I’ve created an instance of DragDropManager in my app whenever a user start drag. And it works well. I test this on real device. Now, I can drag&drop multiple objects at the same time.

What do you think about this?

[joshtynjala]

That seems like a reasonable workaround to me!