Fix mantis #3068.

Make hitting the "delete" key in the pilot-selection menu do the same thing as clicking on the "remove" button.

git-svn-id: svn://svn.icculus.org/fs2open/trunk@11202 387891d4-d844-0410-90c0-e4c51a9137d3
add ship class texture replacement using a simplified method that doesn't require the texture_set code

git-svn-id: svn://svn.icculus.org/fs2open/trunk@11204 387891d4-d844-0410-90c0-e4c51a9137d3