Scaling nuke

This commit introduces new textures and a bit of code so that the nuke targeting reticle scales dynamically according to the unit. It correctly shows inner and outer radius, so it's much better for aiming. It looks as close to the current one as possible (Colour, design etc) but it scales now.
I failed to see this initialization per my lower comment.

A bp with ```CountedProjectile``` and ```NukeWeapon``` but no ```InnerSize``` and ```OuterSize``` will set these to nil, however -- so it's better to initialize to that.