Style Function Improvements

[colicab-d]

Hi there basically im looking to find out if this is possible / if anyone has already hacked this up.

1. The Ability to set it so that not only admins can view non-public styles, i.e so we can add a special preview group or give a group that permission..

2. Post icons per style as at present this isnt poss, theres only the post icon manager and no variable to change the image path unlike all the other images in vB3