Flymode: Spacebar to get close to an object

On Blender, in fly mode the user can get close to objects by clicking on the spacebar.

This would make the flying much more intuitive, and faster for the user to see objects closer whilst in flymode

For us to have similar functionality

• We would need to show crosshairs when the user is in flymode
• If the user clicks on spacebar in the flymode, we go closer to the object which is in the are of crosshairs
• 

Design in Figma: https://www.figma.com/file/80F3En6Rhehbi7PkWewPCI/3D-Editor?type=design&node-id=52%3A697&mode=design&t=lui0jXuKtrD5s1ra-1