Allow player moving between platforms

[nzer]

In 2.1 items can be transferred between platforms, which is great. I expected players to be able to move directly between platforms as well, but it looks like they can't.

This would be nice to add. The drop to planet button could allow other platforms in orbit to be selected as well.

[Zaflis]

Sounds like a nice suggestion, +1. Nothing fancy or overpowered, just as usual make sure target platform won't leave before all of its cargo including player arrives.