Nitpick: give at least two decimals of information for a pos2 in the Debug trait

[gitsmol]

As Emil has written, debugging layout in egui can be tricky. Extra tricky is when working with Pos2 in a coordinate system normalized to 0..=1. In this case, the debugging output for Pos2 formatted as {:.1} gives too little information. This is especially apparent when writing tests:

assertion `left == right` failed
  left: [0.2 0.2]
 right: [0.2 0.2]

I would humbly request for the Debug trait to give at least 2 decimals of the x/y values.

[gitsmol]

Much appreciated!