Theme Loading

[mrehkopf]

Actual proper theme loading, with support for:

• custom logo
• custom font
• custom button gfx (switchable between EU/JP + US)
• font palettes
• background gradient
• per-line customizable selection bar
• arbitrary placement of sprites, to place accents or form a fullscreen background behind the text

[mrehkopf]

(WIP - just need to get the changes out of the way to continue working on the development branch and finally get a 1.11.1 release out lol)

[Ramsis-SNES]

Yay! :D