Print position and rotation of unit leaders

[JackParkes1]

Addresses issue #559

If a unit leader is moved while active by an order token, when it 'stops' its movement through either stopping its activation or clicking 'Done' after moving, a print out will show the original position and its new position.

Example print out.

Notes

• values are rounded to 2 decimal places. There is a lot more precision available, but I thought this was a good compremise for readability.
• I am not aware of a nicer format for unit names in the print out and I have yet looked for a way to include a number indicating which number unit it's for as shown in the issue

[dicewrench]

This looks good, thanks! I will merge and test everything soon.