Fix default viewpoint

We've added a small but useful feature - the ability to fix a new default viewpoint for your mind map.

This allows you to adjust for instances where your mind map naturally builds outwards a little more in certain directions. Using the crosshair in the top toolbar, you can find and fix a viewpoint that makes your mind map look great, and in the case of larger mind maps, has the maximum number of nodes visible.

On an unrelated note, we've fixed some reliability issues with the feature request tool. If you sent us an email and we didn't get back to you, this means we didn't get it! If you still want to get in touch, please resend your message.