POP-FE(-ps3) with THEMES support

This version of pop-fe adds support for themes to pop-fe and pop-fe-ps3.
Themes are sets of manually curated assets for ICON0/PIC0/PIC1 for use with creating beautiful PSX packages for PS3.
The initial/first theme added is from 98DMAKE. Absolutely beautiful theme: https://github.com/98DEMAKE/pop-fe-theme-98demake